Crossword Genius

QB Newton who popularized dabbing

Ross

I believe the answer is:

cam

(Other definitions for cam that I've seen before include "Projection on a rotating shaft in contact with another part" , "Bump on a shaft for pushing another shaft" , "Rotating projection; river" , "Rotating part in machine; river" , "Irregular projection" .)

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