Definition of "Twitch" :
noun: a sudden muscle spasm; especially one caused by a nervous condition
verb: make an uncontrolled, short, jerky motion
"His face is twitching."
verb: move or pull with a sudden motion
verb: squeeze tightly between the fingers
verb: move with abrupt, seemingly uncontrolled motions
verb: toss with a sharp movement so as to cause to turn over in the air