Betray
/bɪˈtreɪ/
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Definition
(verb) To deliver into the hands of an enemy by treachery or fraud, in violation of trust; to give up treacherously or faithlessly.
Sentence Examples
A few words may betray a man's true character.
John is not a man to betray you.
CEFR Practice Quiz
A true friend would never ____ your secrets to anyone else city.