If someone convulses or if they are convulsed by or with something, their body moves suddenly in an uncontrolled way. Olivia's face convulsed in a series of twitches He let out a cry that convulsed his bulky frame and jerked his arm The opposing team were so convulsed with laughter that they almost forgot to hit the ball
To contract violently and irregulary, as the muscular parts of an animal body; to shake with irregular spasms, as in excessive laughter, or in agony from grief or pain
be overcome with laughter make someone convulse with laughter; "The comedian convulsed the crowd" contract involuntarily, as in a spasm; "The muscles in her face convulsed" cause to contract; "The spasm convulses her facial muscles" shake uncotrollably; "earthquakes convulsed the countryside" move or stir about violently; "The feverish patient thrashed around in his bed