to breathe out; to emit from the lungs; to throw out from the mouth or nostrils in the process of respiration; -- opposed to inspire.-to give forth insensibly or gently, as a fluid or vapor; to emit in minute particles; to exhale; as, the earth expires a damp vapor; plants expire odors.-to emit; to give out.-to bring to a close; to terminate.-to emit the breath.-to emit the last breath; to breathe out the life; to die; as, to expire calmly; to expire in agony.-to come to an end; to cease; to terminate; to perish; to become extinct; as, the flame expired; his lease expires to-day; the month expired on saturday.-to burst forth; to fly out with a blast.