Source : Webster's Revised Unabridged Dictionary (1913)

Uncork \Un*cork"\, v. t. [1st pref. un- + {cork}.]
   To draw the cork from; as, to uncork a bottle.

Source : WordNet®

uncork
     v 1: release; "uncork his anger"
     2: draw the cork from (bottles); "uncork the French wine" [ant:
         {cork}]