Twitch

usgb/twɪtʃ/Volume
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LampPro Tip 1/2
Involuntary ReactionPlay
Twitch as a verb often refers to unintentional body movements, not something one does on purpose. SlideWhenever he hears a loud noise, his shoulders twitch.
LampPro Tip 2/2
Sudden MovementPlay
A twitch is usually a quick, sharp motion that happens suddenly, without a gradual buildup. SlideThe cat's ears would twitch at the slightest sound.