Crossword Genius

Idiosyncratic behavior (3)

Ross

I believe the answer is:

tic

(Other definitions for tic that I've seen before include "Jerky movement" , "Localised habitual twitch, especially to the face" , "Involuntary muscular spasm" , "Facial muscle spasm" , "Spasmodic muscular twitch" .)

I've seen this clue in The New York Times.
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