jerk

jerk (http://definr.com/jerk)

     n 1: a dull stupid fatuous person [syn: dork]
     2: an abrupt spasmodic movement [syn: jerking, jolt]
     3: (mechanics) the rate of change of velocity [syn: {rate of
        acceleration}]
     4: a sudden abrupt pull [syn: tug]
     v 1: pull, or move with a sudden movement; "He turned the handle
          and jerked the door open.." [syn: yank]
     2: move with abrupt, seemingly uncontrolled  motions; "The
        patient's legs were jerkings" [syn: twitch]
     3: make an uncontrolled, short, jerky motion; "his face is
        twitching" [syn: twitch]
     4: jump vertically, with legs stiff and back arched, as of
        horses [syn: buck, hitch]
     5: throw or toss with a quick motion; "flick a piece of paper
        across the table"; "jerk his head" [syn: flick, flip]