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Definition of tic noun from the Oxford Advanced Learner's Dictionary

tic

noun
 
/tɪk/
 
/tɪk/
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  1. a sudden, quick movement of a muscle, especially in your face or head, that you cannot control
    • a nervous tic
    • There was a persistent tic in her left cheek.
    Word Originearly 19th cent.: from French, from Italian ticchio.
See tic in the Oxford Advanced American Dictionary
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