1.To breathe out; to emit from the lungs; to throw out from the mouth or nostrils in the process of respiration; opposed to inspire. "Anatomy exhibits the lungs in a continual motion of inspiring and expiring air." "This chafed the boar; his nostrils flames expire."
2.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. "The expiring of cold out of the inward parts of the earth in winter."
3.To emit; to give out. (Obs.)
4.To bring to a close; to terminate. (Obs.) "Expire the term Of a despised life."