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
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