twitch

twitch /tw'ɪtʃ/ (twitches twitching twitched)
[VERB] V, V n
If something, especially a part of your body, twitches or if you twitch it, it makes a little jumping movement.
When I stood up to her, her right cheek would begin to twitch...
Stern twitched his shoulders.
[N-COUNT]
Twitch is also a noun.
He developed a nervous twitch and began to blink constantly.

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