Synonyms of betray in English:
1 I trusted them and they betrayed me
break one's promise to, be disloyal to, be unfaithful to, break faith with, play someone false, fail, let down;
inform on/against, give away, denounce, sell out, stab someone in the back, be a Judas to, give someone a Judas kiss, bite the hand that feeds one;
English Law turn Queen's/King's evidence
informalsplit on, blow the whistle on, rat on, peach on, stitch up, do the dirty on, sell down the river, squeal on, squeak on
British informalgrass on, shop, sneak on
Australian/New Zealand informaldob on, pimp on, pool, shelf, put someone's pot on, point the bone at
[Antonyms] be loyal to
2 she hoped her face didn't betray her feelings
reveal, disclose, divulge, give away, leak, lay bare, make known, uncover, unmask, expose, bring out into the open, tell;
[Antonyms] conceal, hide
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