verbs
pull, or move with a sudden movement
"He turned the handle and jerked the door open"
move with abrupt, seemingly uncontrolled motions
"The patient's legs were jerkings"
make an uncontrolled, short, jerky motion
"his face is twitching"
jump vertically, with legs stiff and back arched
"the yung filly bucked"
throw or toss with a quick motion
"flick a piece of paper across the table"; "jerk his head"