Crossword Genius

A horse's refusal? (5)

Ross

I believe the answer is:

neigh

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But I can't explain it at all! Could you help me understand?

(Other definitions for neigh that I've seen before include "Horse's noise" , "Equine utterance" , "one made by Bucephalus?" , "Mare's cry, e.g." , "Cry coming from mount" .)

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