Giving chocolate to the dog, e.g (4)

I believe the answer is:

nono

(Other definitions for nono that I've seen before include "Something totally unacceptable (informal)" , "Something that would be totally unacceptable" , "Failure (colloq.)" , "Unacceptable thing" , "Non-starter (colloq.)" .)

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

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