| betray | (verb) give away information about somebody | Synonyms: denounce, give away, grass, rat, shit, shop, snitch, stag, tell on |
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| (verb) reveal unintentionally | Synonyms: bewray |
| (verb) cause someone to believe an untruth | Synonyms: deceive, lead astray |
| (verb) disappoint, prove undependable to; abandon, forsake | Synonyms: fail |
| (verb) deliver to an enemy by treachery | Synonyms: sell |
| (verb) be sexually unfaithful to one's partner in marriage | Synonyms: cheat, cheat on, cuckold, wander |
| betrayal | (noun) an act of deliberate betrayal | Synonyms: perfidy, treachery, treason |
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| (noun) the quality of aiding an enemy | - |
| betrayer | (noun) a person who says one thing and does another | Synonyms: double-crosser, double-dealer, traitor, two-timer |
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| (noun) one who reveals confidential information to the police or other authority | Synonyms: blabber, informer, rat, squealer |
| betroth | (verb) give to in marriage | Synonyms: affiance, engage, plight |
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| betrothal | (noun) the act of becoming betrothed or engaged | Synonyms: espousal |
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| (noun) a mutual promise to marry | Synonyms: engagement, troth |
| betrothed | (adjective) pledged to be married | Synonyms: bespoken, engaged |
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| (noun) the person to whom you are engaged | - |