late 12c., to-twic-chen "pull apart with a quick jerk," related to Old English twiccian "to pluck," from Proto-Germanic *twikjonan (cf. Low German twicken, Dutch twikken, Old High German gizwickan, German zwicken "to pinch, tweak"). Related: Twitched; twitching. The noun is attested from 1520s.
v. twitched, twitch·ing, twitch·es
To draw, pull, or move suddenly and sharply; jerk.
To move jerkily or spasmodically.
To ache sharply from time to time; twinge.