Source : Webster's Revised Unabridged Dictionary (1913)

Expectorate \Ex*pec"to*rate\, v. t. [imp. & p. p.
   {Expectorated}; p. pr. & vb. n. {Expectorating}.] [L.
   expecrorare to drive from the breast; ex out + pectus,
   pectiris, breast. See {Pectoral}.]
   To eject from the trachea or lungs; to discharge, as phlegm
   or other matter, by coughing, hawking, and spitting; to spit
   forth.

Expectorate \Ex*pec"to*rate\, v. i.
   To discharge matter from the lungs or throat by hawking and
   spitting; to spit.

Source : WordNet®

expectorate
     v 1: clear out the chest and lungs; "This drug expectorates
          quickly" [syn: {clear out}, {drive out}]
     2: discharge (phlegm or sputum) from the lungs and out of the
        mouth [syn: {cough up}, {cough out}, {spit up}, {spit out}]