It moves when you chu your chow (4)

I believe the answer is:

chin

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'it moves when you chu your chow' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for chin that I've seen before include "Front of lower jaw" , "Punch to the face" , "hit" , "Point of the jaw" , "Protruding feature" .)

I've seen this clue in the Evening Standard.

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