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Betray

/bɪˈtreɪ/

To act against someone or reveal something private or secret that might cause harm or disappointment.

Synonyms:

Friends should never betray each other.He felt betrayed when she ignored his calls.

Middle English from the Old French word betrayre, based on the Latin tradere - to hand over or deliver, with the prefix be- intensified.

13 mentions per 1 million words

Moderate

Hint: Frequency according to COCA