verb

• (transitive) To deliver into the hands of an enemy by treachery or fraud, in violation of trust; to give up treacherously or faithlessly.
• (transitive) To prove faithless or treacherous to, as to a trust or one who trusts; to be false to; to deceive.
• (transitive) To violate the confidence of, by disclosing a secret, or that which one is bound in honor not to make known.
• (transitive) To disclose (a secret, etc.) in deliberate violation of someone’s confidence.
• (transitive) To disclose or indicate, for example something which prudence would conceal; to reveal unintentionally.
• (transitive) To mislead; to expose to inconvenience not foreseen; to lead into error or sin.
• (transitive) To lead astray; to seduce (as under promise of marriage) and then abandon.