An involuntary muscle contraction or spasmodic movement, especially of the face or head. Can also refer to a habitual behavioral pattern or mannerism.
From French 'tic,' possibly imitative of the sound or movement. First recorded in English in the early 18th century in medical contexts, later extended to describe any repetitive habit or quirk.
The word 'tic' is wonderfully onomatopoeic - it sounds like the quick, sharp movements it describes. It's fascinating how we've extended this medical term to describe personality quirks and habits, showing how we understand repetitive behaviors through the lens of involuntary physical movements.
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