Crossword Genius

Ghost in Mario Bros. games, or a ghost's sound (3)

Ross

I believe the answer is:

boo

(Other definitions for boo that I've seen before include "Show displeasure orally" , "Surprising exclamation" , "Poor reception" , "Exclamation to startle" , "Shout of disapproval, maybe at ref" .)

I've seen this clue in the Universal.
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