1.  alarm(n = noun.feeling) consternation, dismay - fear resulting from the awareness of danger;
is a kind of fear, fearfulness, fright
Derived forms verb alarm₂, verb alarm₁

2.  alarm(n = noun.artifact) alarm system, warning device - a device that signals the occurrence of some undesirable event;
is a kind of device
has particulars: automobile horn, car horn, hooter, horn, motor horn, burglar alarm, fire alarm, smoke alarm, horn, siren

3.  alarm(n = noun.communication) alarum, alert, warning signal - an automatic signal (usually a sound) warning of danger;
is a kind of sign, signal, signaling
has particulars: torpedo, air alert, burglar alarm, fire alarm, foghorn, fogsignal, horn, red flag, siren, alarm bell, tocsin

4.  alarm(n = noun.artifact) alarm clock - a clock that wakes a sleeper at some preset time;
is a kind of clock

1.  alarm(v = verb.emotion) appal, appall, dismay, horrify - fill with apprehension or alarm; cause to be unpleasantly surprised; "I was horrified at the thought of being late for my interview"; "The news of the executions horrified us"
is one way to affright, fright, frighten, scare
Derived forms noun alarm₁, noun alarmist₁
Sample sentences: The bad news will alarm him

2.  alarm(v = verb.communication) alert - warn or arouse to a sense of danger or call to a state of preparedness; "The empty house alarmed him"; "We alerted the new neighbors to the high rate of burglaries"
is one way to warn
Derived form noun alarm₁
Sample sentences: Somebody ----s somebody; Something ----s somebody

1.  A summons to arms, as on the approach of an enemy. [1913 Webster]
"Arming to answer in a night alarm." [1913 Webster]

2.  Any sound or information intended to give notice of approaching danger; a warning sound to arouse attention; a warning of danger. [1913 Webster]
"Sound an alarm in my holy mountain." [1913 Webster]

3.  A sudden attack; disturbance; broil. Shak. [1913 Webster]
"Thy palace fill with insults and alarms." [1913 Webster]

4.  Sudden surprise with fear or terror excited by apprehension of danger; in the military use, commonly, sudden apprehension of being attacked by surprise. [1913 Webster]
"Alarm and resentment spread throughout the camp." [1913 Webster]

5.  A mechanical contrivance for awaking persons from sleep, or rousing their attention; an alarum. [1913 Webster]

1.  To call to arms for defense; to give notice to (any one) of approaching danger; to rouse to vigilance and action; to put on the alert. [1913 Webster]

2.  To keep in excitement; to disturb. [1913 Webster]

3.  To surprise with apprehension of danger; to fill with anxiety in regard to threatening evil; to excite with sudden fear. [1913 Webster]
"Alarmed by rumors of military preparation." [1913 Webster]

alarm, n. & v.
--n.
1 a warning of danger etc. (gave the alarm).
2 a a warning sound or device (the burglar alarm was set off accidentally). b = alarm clock.
3 frightened expectation of danger or difficulty (were filled with alarm).
--v.tr.
1 frighten or disturb.
2 arouse to a sense of danger.

Idiom:
alarm clock a clock with a device that can be made to sound at the time set in advance.

Etymology:
ME f. OF alarme f. It. allarme f. all' arme! to arms

N  danger, peril, insecurity, jeopardy, risk, hazard, venture, precariousness, slipperiness, instability, defenselessness, exposure, vulnerability, vulnerable point, heel of Achilles, forlorn hope, leap in the dark, road to ruin, faciles descensus Averni, hairbreadth escape, cause for alarm, source of danger, rock ahead, breakers ahead, storm brewing, clouds in the horizon, clouds gathering, warning, alarm, apprehension, in danger, endangered, fraught with danger, dangerous, hazardous, perilous, parlous, periculous, unsafe, unprotected &c (safe, protect), insecure, untrustworthy, built upon, sand, on a sandy basis, wildcat, defenseless, fenceless, guardless, harborless, unshielded, vulnerable, expugnable, exposed, open to, aux abois, at bay, on the wrong side of the wall, on a lee shore, on the rocks, at stake, in question, precarious, critical, ticklish, slippery, slippy, hanging by a thread, with a halter round one's neck, between the hammer and the anvil, between Scylla and Charybdis, between a rock and a hard place, between the devil and the deep blue sea, between two fires, on the edge of a precipice, on the brink of a precipice, on the verge of a precipice, on the edge of a volcano, in the lion's den, on slippery ground, under fire, not out of the wood, unwarned, unadmonished, unadvised, unprepared, off one's guard, tottering, unstable, unsteady, shaky, top-heavy, tumbledown, ramshackle, crumbling, waterlogged, helpless, guideless, in a bad way, reduced to the last extremity, at the last extremity, trembling in the balance, nodding to its fall, threatening, ominous, illomened, alarming, explosive, adventurous, incidit in Scyllam qui vult vitare Charybdim, nam tua res agitur paries dum proximus ardet.

N  warning, early warning, caution, caveat, notice, premonition, premonishment, prediction, contraindication, lesson, dehortation, admonition, monition, alarm, handwriting on the wall, mene mene tekel upharsin, red flag, yellow flag, fog-signal, foghorn, siren, monitor, warning voice, Cassandra, signs of the times, Mother Cary's chickens, stormy petrel, bird of ill omen, gathering clouds, clouds in the horizon, death watch, watchtower, beacon, signal post, lighthouse, sentinel, sentry, watch, watchman, watch and ward, watchdog, bandog, housedog, patrol, patrolman, vedette, picket, bivouac, scout, spy, spial, undercover agent, mole, plainclothesman, advanced guard, rear guard, lookout, cautiousness, monitor, guard camera, radar, AWACS, spy satellite, spy-in-the- sky, U2 plane, spy plane, warning, premonitory, monitory, cautionary, admonitory, admonitive, sematic, warned, forewarned, on one's guard, in terrorem, Int, beware!, ware!, take care!, look out!, fore (golf), mind what you are about!, take care what you are about!, mind!, ne reveillez pas le chat qui dort, don't wake a sleeping cat, foenum habet in cornu, caveat actor, le silence du people est la legon des rois, verbum sat sapienti, a word to the wise is sufficient, un averti en vaut deux.

N  alarm, alarum, larum, alarm bell, tocsin, alerts, beat of drum, sound of trumpet, note of alarm, hue and cry, fire cross, signal of distress, blue lights, war-cry, war- whoop, warning, fogsignal, foghorn, yellow flag, danger signal, red light, red flag, fire bell, police whistle, false alarm, cry of wolf, bug-bear, bugaboo, alarming, Int, sauve qui peut!, every man for himself!, qui vive?.

VB  give the alarm, raise the alarm, sound the alarm, turn in the alarm, beat the alarm, give an alarm, raise an alarm, sound an alarm, turn in an alarm, beat an alarm, alarm, warn, ring the tocsin, battre la generale, cry wolf.

VB  fear, stand in awe of, be afraid, have qualms, apprehend, sit upon thorns, eye askance, distrust, hesitate, falter, funk, cower, crouch, skulk, let 'I dare not' wait upon 'I would' take fright, take alarm, start, wince, flinch, shy, shrink, fly, tremble, shake, shiver, shiver in one's shoes, shudder, flutter, shake like an aspen leaf, tremble like an aspen leaf, tremble all over, quake, quaver, quiver, quail, grow pale, turn pale, blench, stand aghast, not dare to say one's soul is one's own, inspire fear, excite fear, inspire awe, excite awe, raise apprehensions, be in a daze, bulldoze, faze, feeze, give an alarm, raise an alarm, sound an alarm, alarm, startle, scare, cry 'wolf', disquiet, dismay, fright, frighten, terrify, astound, fright from one's propriety, fright out of one's senses, fright out of one's wits, fright out of one's seven senses, awe, strike all of a heap, strike an awe into, strike terror, harrow up the soul, appall, unman, petrify, horrify, pile on the agony, make one's flesh creep, make one's hair stand on end, make one's blood run cold, make one's teeth chatter, take away one's breath, stop one's breath, make one tremble, haunt, prey on the mind, weigh on the mind, put in fear, put in bodily fear, terrorize, intimidate, cow, daunt, overawe, abash, deter, discourage, browbeat, bully, threaten.

N  indication, symbolism, symbolization, semiology, semiotics, semeiology, semeiotics, Zeitgeist, characteristic, diagnostic, lineament, feature, trait, fingerprint, voiceprint, footprint, noseprint, cloven hoof, footfall, recognition (memory), diagnostic, divining rod, detector, sign, symbol, index, indice, indicator, point, pointer, exponent, note, token, symptom, dollar sign, dollar mark, type, figure, emblem, cipher, device, representation, epigraph, motto, posy, gesture, gesticulation, pantomime, wink, glance, leer, nod, shrug, beck, touch, nudge, dactylology, dactylonomy, freemasonry, telegraphy, chirology, byplay, dumb show, cue, hint, clue, clew, key, scent, signal, signal post, rocket, blue light, watch fire, watch tower, telegraph, semaphore, flagstaff, cresset, fiery cross, calumet, heliograph, guidon, headlight, mark, scratch, line, stroke, dash, score, stripe, streak, tick, dot, point, notch, nick, print, imprint, impress, impression, keyboard symbols, printing symbols, red letter, italics, sublineation, underlining, bold font, jotting, note, annotation, reference, blaze, cedilla, guillemets, hachure, quotation marks, ", double quotes, " ", parentheses, "( )", brackets, "", braces, "", left arrow, "<", right arrow, ">", forward slash, "/", backward slash, "\", exclamation point, "!", commercial at, "@", pound sign, "#", percent sign, "%", carat, "", ampersand, "&", asterisk, "*", hyphen, "-", dash, "-", "_", em dash, "--", plus sign, "+", equals sign, "=", question mark, "?", period, ", ", semicolon, ", ", colon, ":", comma, ", ", apostrophe, "'", single quote, "'", tilde, "~", badge, criterion, countercheck, countermark, countersign, counterfoil, duplicate, tally, label, ticket, billet, letter, counter, check, chip, chop, dib, totem, tessera, card, bill, witness, voucher, stamp, cacher, trade mark, Hall mark, signature, mark, autograph, autography, attestation, hand, hand writing, sign manual, cipher, seal, sigil, signet, hand and seal, paraph, brand, superscription, indorsement, endorsement, password, watchword, catchword, security card, pass, passkey, credentials, open sesame, timbrology, mot de passe, mot du guet, pass-parole, shibboleth, title, heading, docket, address card, visiting card, carte de visite, insignia, banner, banneret, bannerol, bandrol, flag, colors, streamer, standard, eagle, labarum, oriflamb, oriflamme, figurehead, ensign, pennon, pennant, pendant, burgee, blue Peter, jack, ancient, gonfalon, union jack, banderole, old glory, quarantine flag, vexillum, yellow-flag, yellow jack, tricolor, stars and stripes, bunting, heraldry, crest, coat of arms, arms, armorial bearings, hatchment, escutcheon, scutcheon, shield, supporters, livery, uniform, cockade, epaulet, chevron, garland, love knot, favor, beacon, cairn, post, staff, flagstaff, hand, pointer, vane, cock, weathercock, guidepost, handpost, fingerpost, directing post, signpost, pillars of Hercules, pharos, bale-fire, beacon-fire, l'etoile du Nord, landmark, seamark, lighthouse, balize, polestar, loadstar, lodestar, cynosure, guide, address, direction, name, sign, signboard, warning, omen, prefigurement, trace, record, warning &c, alarm, scepter, trophy, gauge, milestone, milepost, brand, fool's cap, check, telltale, test, mileage ticket, milliary, notification, advertisement, word of command, call, bugle call, trumpet call, bell, alarum, cry, battle cry, rallying cry, angelus, reveille, sacring bell, sanctus bell, exposition &c (explanation), proof, pattern, indicating, indicative, indicatory, denotative, connotative, diacritical, representative, typical, symbolic, pantomimic, pathognomonic, symptomatic, characteristic, demonstrative, diagnostic, exponential, emblematic, armorial, individual, known by, recognizable by, indicated, pointed, marked, denotable, indelible, in token of, symbolically, in dumb show, ecce signum, ex ungue leonem, ex pede Herculem, vide ut supra, vultus ariete fortior.

alarm bell, alarm clock, alarm system, burglar alarm, false alarm, fire alarm, smoke alarm