twitch

(noun) a sudden muscle spasm; especially one caused by a nervous condition. Synonyms: twitching, vellication.

(verb) make an uncontrolled, short, jerky motion. Synonyms: jerk. Examples: "His face is twitching."

(verb) move with abrupt, seemingly uncontrolled motions. Synonyms: jerk. Examples: "The patient's legs were jerkings."

(verb) toss with a sharp movement so as to cause to turn over in the air. Synonyms: flip.

(verb) squeeze tightly between the fingers. Synonyms: pinch, squeeze, twinge, tweet, nip. Examples: "He pinched her behind." "She squeezed the bottle."

(verb) move or pull with a sudden motion.