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English definition of “twitch”

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twitch

verb [I/T]  /twɪtʃ/ us  
to make a short and sudden movement, or to cause part of your body to move suddenly: [I] She saw his mouth twitch into a little smile that disappeared almost at once.
twitch
noun [C]  /twɪtʃ/ us  
She signalled with a twitch of her finger.
(Definition of twitch from the Cambridge Academic Content Dictionary © Cambridge University Press)
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