betray

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

Quresh betrayed Sunil to marry Nuzhat.

To violate the confidence of, by disclosing a secret, or that which one is bound in honor not to make known.

To disclose (a secret, etc.) in deliberate violation of someone’s confidence.

The dead leap at the throat, destroy The meaning of the day; dark forms Have scaled your walls, and spies betray Old secrets to amorphous swarms.

To disclose or indicate, for example something which prudence would conceal; to reveal unintentionally.

Though he had lived in England for many years, a faint accent betrayed his Swedish origin.

Jones’ sad eyes betray a pervasive pain his purposefully spare dialogue only hints at, while the perfectly cast [Josh] Brolin conveys hints of playfulness and warmth while staying true to the craggy stoicism at the character’s core.