To deliver into the hands of an enemy by treachery or fraud, in violation of trust; to give up treacherously or faithlessly.
An officer betrayed the city.
To prove faithless or treacherous to, as to a trust or one who trusts; to be false to; to deceive.
to betray a person or a cause
To violate the confidence of, by disclosing a secret, or that which one is bound in honor not to make known.
From Middle English betrayen, bitrayen (“to commit an act of treason against”), equivalent to be- + tray (“to betray”). further etymology information Middle English bi- is from Old English be- (“be-”)...
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