A sudden quick jerking movement of muscles, usually involuntary; to move with such sudden jerks.
From Old English 'twiccian' meaning 'to pull or tug quickly.' It's an onomatopoetic word—the sound and meaning seem connected, as the word itself feels like a quick movement.
A nervous twitch is your body's automatic alarm system firing—when you're anxious or tense, muscles contract involuntarily. Professional gamers use the term 'Twitch' for their livestreaming platform because gaming is all about fast reflexive twitches.
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