Definitions of twitch:

• noun:   a sudden muscle spasm; especially one caused by a nervous condition
• verb:   make an uncontrolled, short, jerky motion

  Example: "His face is twitching"

• verb:   move or pull with a sudden motion
• verb:   move with abrupt, seemingly uncontrolled motions
• verb:   toss with a sharp movement so as to cause to turn over in the air
• verb:   squeeze tightly between the fingers