convulse
     v 1: make someone convulse with laughter; "The comedian convulsed
          the crowd"
     2: be overcome with laughter
     3: move or stir about violently; "The feverish patient thrashed
        around in his bed" [syn: {thresh}, {thresh about}, {thrash},
         {thrash about}, {slash}, {toss}, {jactitate}]
     4: shake uncotrollably; "earthquakes convulsed the countryside"
     5: cause to contract; "The spasm convulses her facial muscles"
     6: contract involuntarily, as in a spasm; "The muscles in her
        face convulsed"
Source: WordNet® 2.0