discontinue
     v 1: put an end to a state or an activity; "Quit teasing your
          little brother" [syn: {stop}, {cease}, {give up}, {quit},
           {lay off}] [ant: {continue}]
     2: come or be at an end; "the support from our sponsoring
        agency will discontinue after March 31" [ant: {continue}]
     3: prevent completion; "stop the project"; "break off the
        negociations" [syn: {break}, {break off}, {stop}]
Source: WordNet® 2.0