Be·tray v. t. [imp. & p. p. Betrayed p. pr. & vb. n. Betraying.]
 1. To deliver into the hands of an enemy by treachery or fraud, in violation of trust; to give up treacherously or faithlessly; as, an officer betrayed the city.
    Jesus said unto them, The Son of man shall be betrayed into the hands of men.   --Matt. xvii. 22.
 2. To prove faithless or treacherous to, as to a trust or one who trusts; to be false to; to deceive; as, to betray a person or a cause.
    But when I rise, I shall find my legs betraying me.   --Johnson.
 3. To violate the confidence of, by disclosing a secret, or that which one is bound in honor not to make known.
    Willing to serve or betray any government for hire.   --Macaulay.
 4. To disclose or discover, as something which prudence would conceal; to reveal unintentionally.
    Be swift to hear, but cautious of your tongue, lest you betray your ignorance.   --T. Watts.
 5. To mislead; to expose to inconvenience not foreseen to lead into error or sin.
    Genius . . . often betrays itself into great errors.   --T. Watts.
 6. To lead astray, as a maiden; to seduce (as under promise of marriage) and then abandon.
 7. To show or to indicate; -- said of what is not obvious at first, or would otherwise be concealed.
    All the names in the country betray great antiquity.   --Bryant.

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 betraying
      adj : revealing unintentionally; "a betraying blush spread over
            her face"