Sudden, involuntary jerking movements of muscles, or the third-person singular verb meaning to make such movements.
From Middle English 'twich,' possibly from Old English or Germanic roots related to sudden pulling or jerking. The word has been used since medieval times to describe involuntary muscle movements and sudden actions.
Twitches are your body's involuntary signals—and interestingly, some scientists think they might be leftover 'test runs' from your brain practicing movements while you sleep, which is why you jerk awake sometimes.
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