TWITCH
—verb. 1 (of features, muscles, etc.) Move or contract spasmodically. 2 pull sharply at. —none. 1 sudden involuntary contraction or movement. 2 sudden pull or jerk. 3 colloq. State of nervousness. ? twitchy adjective. (-ier, -iest) (in sense 3 of n.). [probably old english]