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