To renounce; reject; refuse; repudiate; cast off.To revolt at; reject from dislike; disapprove.To challenge to contest or trial with arms; dare to meet in combat.To challenge to an action or procedure of any kind; dare to do something (generally with an implication of belief that it cannot be done, or that the action will fail of its purpose).To dare; brave; manifest a contempt of or indifference to (opposition, attack, or hostile force); set at naught; resist successfully: as, to defy the arguments of an opponent; to defy the power of a magistrate.To reject; eject; void: with out.To digest.To digest; be digested.n. A challenge; a defiance.