1.  shudder(n = noun.feeling) chill, frisson, quiver, shiver, thrill, tingle - an almost pleasurable sensation of fright; "a frisson of surprise shot through him"
is a kind of fear, fearfulness, fright
Derived form adjective shuddery₁

2.  shudder(n = noun.act) tremor - an involuntary vibration (as if from illness or fear);
is a kind of quiver, quivering, vibration
Derived forms verb shudder₁, verb shudder₂

1.  shudder(v = verb.body) shiver - shake, as from cold; "The children are shivering--turn on the heat!"
is one way to move involuntarily, move reflexively
Derived form noun shudder₂
Sample sentences: Something ----s; Somebody ----s

2.  shudder(v = verb.motion) shiver, thrill, throb - tremble convulsively, as from fear or excitement;
is one way to tremble
Derived form noun shudder₂
Sample sentences: Something ----s; Somebody ----s

   To tremble or shake with fear, horrer, or aversion; to shiver with cold; to quake. Milton. [1913 Webster]
"The shuddering tennant of the frigid zone." [1913 Webster]

   The act of shuddering, as with fear. Shak. [1913 Webster]

shudder, v. & n.
--v.intr.
1 shiver esp. convulsively from fear, cold, repugnance, etc.
2 feel strong repugnance etc. (shudder to think what might happen).
3 (of a machine etc.) vibrate or quiver.
--n.
1 the act or an instance of shuddering.
2 (in pl.; prec. by the) colloq. a state of shuddering.

Derivative:
shudderingly adv. shuddery adj.

Etymology:
ME shod(d)er f. MDu. schuderen, MLG schoderen f. Gmc

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.

VB  be cold, shiver, starve, quake, shake, tremble, shudder, didder, quiver, freeze, freeze to death, perish with cold, freeze, horripilate, make the skin crawl, give one goose flesh.