Yes, twitching is a Scrabble word!

Verb

1. Make an uncontrolled, short, jerky motion

2. Move with abrupt, seemingly uncontrolled motions

3. Toss with a sharp movement so as to cause to turn over in the air

4. Squeeze tightly between the fingers

5. Move or pull with a sudden motion

Noun

1. A sudden muscle spasm; especially one caused by a nervous condition