Past tense of betray; to act disloyally toward someone who trusts you. To reveal secrets or break faith with someone who depended on your loyalty.
From Middle English 'bitraien', from Old French 'trair' meaning 'to hand over', ultimately from Latin 'tradere' (to give up, deliver). The prefix 'be-' intensifies the meaning, making it 'to hand over completely' or 'to give up treacherously'.
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