What is the meaning of jerk?

noun

• A dull stupid fatuous person.
  • synonyms: dork
• An abrupt spasmodic movement.
  • synonyms: jerking, jolt, saccade
• Mechanics) the rate of change of acceleration. (
• Meat (especially beef) cut in strips and dried in the sun.
  • synonyms: jerky, jerked meat
• Raising a weight from shoulder height to above the head by straightening the arms.
• A sudden abrupt pull.
  • synonyms: tug

verb

• Pull, or move with a sudden movement.
  • usage: "He turned the handle and jerked the door open"
  • synonyms: yank
• Move with abrupt, seemingly uncontrolled motions.
  • usage: "The patient's legs were jerkings"
  • synonyms: twitch
• Make an uncontrolled, short, jerky motion.
  • usage: "his face is twitching"
  • synonyms: twitch
• Jump vertically, with legs stiff and back arched.
  • usage: "the yung filly bucked"
  • synonyms: buck, hitch
• Throw or toss with a quick motion.
  • usage: "flick a piece of paper across the table"; "jerk his head"
  • synonyms: flick