1.  open up(v = verb.contact) open - cause to open or to become open; "Mary opened the car door"
Sample sentences: They want to open up the doors

2.  open up(v = verb.change) open - become available; "an opportunity opened up"
is one way to arise, come up
Sample sentences: Something ----s

3.  open up(v = verb.change) open - make available; "This opens up new possibilities"
is one way to afford, give, yield
Sample sentences: Somebody ----s something; Something ----s something

4.  open up(v = verb.creation) pioneer - open up an area or prepare a way; "She pioneered a graduate program for women students"
is one way to innovate, introduce
Sample sentences: Somebody ----s something

5.  open up(v = verb.social) open - start to operate or function or cause to start operating or functioning; "open a business"
Sample sentences: The business is going to open up

6.  open up(v = verb.contact) open - become open; "The door opened"
is one way to change state, turn
Sample sentences: The doors open up

7.  open up(v = verb.communication) - talk freely and without inhibition;
is one way to mouth, speak, talk, utter, verbalise, verbalize
Antonym: close up
Sample sentences: Sam and Sue open up

VB  begin, start, commence, conceive, open, dawn, set in, take its rise, enter upon, enter, set out, embark in, incept, initiate, launch, inaugurate, inchoate, rise, arise, originate, usher in, lead off, lead the way, take the lead, take the initiative, head, stand at the head, stand first, stand for, lay the foundations, found, set up, set on foot, agoing, set abroach, set the ball in motion, apply the match to a train, broach, open up, open the door to, get underway, set about, get to work, set to work, set to, make a beginning, make a start, handsel, take the first step, lay the first stone, cut the first turf, break ground, break the ice, break cover, pass the Rubicon, cross the Rubicon, open fire, open the ball, ventilate, air, undertake, come into existence, come into the world, make one's debut, take birth, burst forth, break out, spring up, spring forth, crop up, pop up, appear, materialize, begin at the beginning, begin ab ovo, begin again, begin de novo, start afresh, make a fresh start, take it from the top, shuffle the cards, reshuffle the cards, resume, recommence.

VB  disclose, discover, dismask, draw the veil, draw aside the veil, lift the veil, raise the veil, lift up the veil, remove the veil, tear aside the veil, tear the curtain, unmask, unveil, unfold, uncover, unseal, unkennel, take off the seal, break the seal, lay open, lay bare, expose, open, open up, bare, bring to light, divulge, reveal, break, squeal, tattle, sing, rat, snitch, let into the secret, reveal the secrets of the prison house, tell, breathe, utter, blab, peach, let out, let fall, let drop, let slip, spill the beans, let the cat out of the bag, betray, tell tales, come out of school, come out with, give vent, give utterance to, open the lips, blurt out, vent, whisper about, speak out, make public, unriddle, split, acknowledge, allow, concede, grant, admit, own, own up to, confess, avow, throw off all disguise, turn inside out, make a clean breast, show one's hand, show one's cards, unburden one's mind, disburden one's mind, disburden one's conscience, disburden one's heart, open one's mind, lay bare one's mind, tell a piece of one's mind, unbosom oneself, own to the soft impeachment, say the truth, speak the truth, turn King's evidence, Queen's evidence, acknowledge the corn, raise the mask, drop the mask, lift the mask, remove the mask, throw off the mask, expose, lay open, undeceive, unbeguile, disabuse, set right, correct, open the eyes of, d_esillusionner, be disclosed, transpire, come to light, come in sight, become known, escape the lips, come out, ooze out, creep out, leak out, peep out, crop-out, show its face, show its colors, discover itself, break through the clouds, flash on the mind.

act up, add up, ante up, back up, backed up, ball up, balled up, bang up, bear up, beat up, beef up, beefed up, belly up, belt up, bind up, blaze up, block up, blow up, blowing up, blown up, board up, bob up, bollix up, bollixed up, bollocks up, bolster up, bomb up, bone up, book up, boost up, botch up, bottle up, bound up, box up, brace up, break open, break up, brick up, bridle up, bring up, bringing up, brisk up, bristle up, brush up, bubble up, buck up, bucked up, build up, bump up, bunch up, bundle up, buoy up, burn up, bust up, butter up, button up, buy up, call up, carve up, cast up, catch up, catch up with, caught up, caught up in, chain up, chalk up, charge up, chat up, check up on, cheer up, chew up, chin up, chirk up, chock up, choke up, choose up, chop up, chuck up the sponge, chum up, churn up, clam up, clap up, clean up, clear up, click open, climb up, clock up, clog up, close up, cloud up, clouding up, clutter up, cobble up, cock up, come up, come up against, come up to, conjure up, cook up, coop up, cork up, cotton up, cough up, coughing up, couple up, cover up, cozy up, crack up, crank up, crap up, creep up, crock up, crop up, curl up, curled up, cut up, dam up, deck up, dig up, digging up, dish up, divided up, divvy up, do up, doctor up, doll up, dolled up, done up, dope up, double up, drag up, draw up, dream up, dredge up, dress up, dried up, drink up, drive up, drive up the wall, drop open, drum up, dry up, drying up, dummy up, earth up, ease up, eat up, edge up, end up, even up, face up, face up to, faggot up, fake up, fall open, fancied up, fancy up, fatten up, fed up, felt up, fess up, fetch up, fig up, fill up, finish up, fire up, firm up, fix up, flame up, flare up, fluff up, fly open, fog up, fold up, follow up, follow up on, foot up, fork up, fort up, foul up, frame up, freshen up, fuck up, furbish up, gang up, gang up on, gas up, gather up, gear up, get up, ginger up, give up, giving up, glam up, go up, go up in smoke, gobble up, grow up, grown up, grub up, gum up, gummed up, gussied up, gussy up, ham it up, hang up, hard up, hash up, haul up, head up, heap up, heat up, heated up, heave up, heft up, held up, het up, high up, higher up, hike up, hit it up, hit up, hitch up, hive up, hoke up, hold open, hold up, hole up, hook up, hook up with, hop up, hopped up, hot up, hung up, hurry up, hush up, hype up, ice up, jack up, jazz up, jolly up, juice up, jump up, jumping up and down, keep one's eyes open, keep open, keep up, kept up, key up, keyed up, kick up, kink up, kit up, knock up, lace up, laid up, land up, lap up, laugh it up, lay up, lead up, let up, lift up, light up, lighten up, limber up, line up, lined up, link up, live it up, live up to, liven up, load up, lock up, log up, look up, look up to, looking up, loosen up, louse up, made up, make up, make up one's mind, make up to, mark up, mat up, matte up, measure up, measure up to, meet up with, mess up, messed up, mix up, mixed up, mock up, mop up, mount up, mount up to, move up, muck up, mucked up, muddy up, muffle up, mug up, muster up, offer up, open, open account, open air, open and aboveboard, open chain, open circuit, open classroom school, open door, open eyed, open fire, open fireplace, open forum, open fracture, open frame, open house, open interval, open letter, open market, open marriage, open minded, open order, open primary, open sandwich, open sea, open secret, open sesame, open shop, open sight, open society, open to, open to question, open university, open verdict, open weave, out in the open, own up, pal up, pass up, patch up, pay up, pen up, pent up, pep up, perk up, perked up, pick up, pick up the gauntlet, pile up, pin up, pipe up, play up, play up to, plump up, point up, polish up, pony up, pop up, pound up, prang up, pretty up, prick up, prim up, prop up, propping up, psych up, psyched up, puff up, puffed up, pull up, pull up short, pull up stakes, pumped up, push up, put up, put up job, put up to, put up with, queue up, rachet up, rack up, raise up, rake up, ramp up, rev up, rig up, ring up, rip up, rise up, roll up, rope up, rough up, round up, rout up, rub up, ruck up, ruffle up, run up, runner up, sack up, save up, saved up, scale up, scare up, scoop up, scrape up, scratch up, screw up, scrub up, scrunch up, seal up, sell up, serve up, set up, sew up, sex up, shack up, shake up, shape up, shine up, shine up to, shoot up, shore up, shoring up, show up, shown up, shrivel up, shut up, sidle up, sign up, silt up, sit up, size up, slack up, slice up, slick up, slicked up, slip up, slow up, slurp up, smarten up, smash up, smell up, snap up, snarl up, snatch up, sneak up, soak up, soaking up, soar up, sober up, soften up, sop up, soup up, speak up, speak up for, spear up, speed up, speeded up, spice up, spiff up, spiffed up, spirit up, spit up, split up, sponge up, spring up, spruce up, spruced up, square up, stack up, stand up, stand up for, stand up to, start up, stay up, steam up, steamed up, step up, stick up, stick up for, stink up, stir up, stirred up, stop up, stopped up, stored up, straighten up, strike up, string up, stuck up, suck up, suck up to, sum up, summing up, summon up, sunny-side up, swallow up, sweep up, swell up, swept up, swoop up, swot up, take up, take up arms, take up with, taken up, tart up, team up, tear up, tee up, tense up, think up, throw up, tidy up, tie up, tied up, tier up, tighten up, tog up, togged up, tone up, toss up, tot up, tote up, touch up, touch up paint, trice up, trick up, trip up, true up, trump up, trumped up, tune up, turn up, turn up the heat, turn up the pressure, turned up, tying up, up, up and down, up country, up here, up in arms, up in the air, up on, up quark, up the stairs, up to, up to her neck, up to his neck, up to my neck, up to now, up to our necks, up to their necks, up to your neck, use up, used up, using up, vamp up, vomit up, wake up, waking up, wall up, warm up, wash up, washed up, well up, whip up, whomp up, whoop it up, wide open, wide open spaces, wind up, wipe up, wise up, with open arms, work up, worked up, wound up, wrack up, wrap up, wrapped up, wrapped up in, write up, wrought up, yield up, zip up