v. t. [ imp. & p. p. Expired p. pr & vb. n. Expiring. ] [ L. expirare, exspirare, expiratum, exspiratum; ex out + spirare to breathe: cf. F. expirer. See Spirit. ] 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. [ 1913 Webster ]

Anatomy exhibits the lungs in a continual motion of inspiring and expiring air. Harvey. [ 1913 Webster ]

This chafed the boar; his nostrils flames expire. Dryden. [ 1913 Webster ]

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. [ 1913 Webster ]

The expiring of cold out of the inward parts of the earth in winter. Bacon. [ 1913 Webster ]

3. To emit; to give out. [ Obs. ] Dryden. [ 1913 Webster ]

4. To bring to a close; to terminate. [ Obs. ] [ 1913 Webster ]

Expire the term
Of a despised life. Shak. [ 1913 Webster ]

v. i. 1. To emit the breath. [ 1913 Webster ]

2. To emit the last breath; to breathe out the life; to die; as, to expire calmly; to expire in agony. [ 1913 Webster ]

3. 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. [ 1913 Webster ]

4. To burst forth; to fly out with a blast. [ Obs. ] “The ponderous ball expires.” Dryden. [ 1913 Webster ]

adj. having come to an end or become void after passage of a period of time; as, an expired passport; caught driving with an expired license. Opposite of unexpired. [ WordNet 1.5 ]