give away

bestow, give, forego; exposure of a secret, revelation

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Verb
1. make a gift of; "She gave away her antique furniture"
(hypernym) give, gift, present
2. make known to the public information that was previously known only to a few people or that was meant to be kept a secret; "The auction house would not disclose the price at which the van Gogh had sold"; "The actress won't reveal how old she is"; "bring out the truth"; "he broke the news to her"
(synonym) disclose, let on, bring out, reveal, discover, expose, divulge, impart, break, let out
(hypernym) tell
(hyponym) blackwash
(cause) break, get out, get around
(verb-group) break, get out, get around
(derivation) giveaway
3. formally hand over to the bridegroom in marriage; of a bride by her father
(hypernym) hand over, fork over, fork out, fork up, turn in, get in, deliver, render
4. give away information about somebody; "He told on his classmate who had cheated on the exam"
(synonym) denounce, tell on, betray, rat, grass, shit, shop, snitch, stag
(hypernym) inform
(hyponym) sell out

let (a secret) become known I tried to stop her before she gave away my plans to go to Mexico for a holiday.

ci3 di4 wu2 yin2 san1 bai3 liang3
No three hundred taels of silver hidden here.
This expression is used to describe a person who tries to conceal or cover up something, but gives himself away by the act.

Synonyms and related words:
abandon, abjure, arrange a match, babble, be indiscreet, be unguarded, bestow, betray, betray a confidence, blab, blabber, blurt, blurt out, break, break open, break up, burst, cast, cast aside, cast away, cast off, cede, chuck, come apart, come unstuck, couple, crack, deep-six, devote, discard, disclose, discover, disgorge, disintegrate, dispense with, dispose of, ditch, divulge, do without, donate, drop, dump, eighty-six, eliminate, fall to pieces, fissure, forgo, forswear, fracture, get along without, get quit of, get rid of, get shut of, give up, give way, hand out, have done with, hitch, inform, inform on, jettison, jilt, join, join together, kiss good-bye, leak, let drop, let fall, let slip, make a match, make a sacrifice, make one, marry, match, mouth, nuptial, part with, peach, present, quitclaim, rat, recant, reject, relinquish, remove, render up, renounce, resign, retract, reveal a secret, rupture, sacrifice, sing, slough, snap, spare, spill, spill the beans, splice, split, spring a leak, squeal, start, stool, surrender, swear off, talk, tattle, tattle on, tell, tell on, tell secrets, tell tales, throw away, throw out, throw over, throw overboard, throw up, toss overboard, unite, unite in marriage, vacate, waive, wed, yield