Source : Webster's Revised Unabridged Dictionary (1913)

Expire \Ex*pire"\, v. i.
   1. To emit the breath.

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

   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.

   4. To burst forth; to fly out with a blast. [Obs.] ``The
      ponderous ball expires.'' --Dryden.

Expire \Ex*pire"\, 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.

            Anatomy exhibits the lungs in a continual motion of
            inspiring and expiring air.           --Harvey.

            This chafed the boar; his nostrils flames expire.
                                                  --Dryden.

   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.                      --Bacon.

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

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

            Expire the term Of a despised life.   --Shak.

Source : WordNet®

expire
     v 1: lose validity; "My passports expired last month" [syn: {run
          out}]
     2: pass from physical life and lose all all bodily attributes
        and functions necessary to sustain life; "She died from
        cancer"; "They children perished in the fire"; "The
        patient went peacefully" [syn: {die}, {decease}, {perish},
         {go}, {exit}, {pass away}, {pass}] [ant: {be born}]
     3: expel air; "Exhale when you lift the weight" [syn: {exhale},
         {breathe out}] [ant: {inhale}]