twitch (v.) Look up twitch at Dictionary.com
late 12c., to-twic-chen "pull apart with a quick jerk," related to Old English twiccian "to pluck, gather, catch hold of," from Proto-Germanic *twikjon- (cognates: Low German twicken, Dutch twikken, Old High German gizwickan, German zwicken "to pinch, tweak"). Related: Twitched; twitching.
twitch (n.) Look up twitch at Dictionary.com
1520s, from twitch (v.).