Crossword Genius

With 55-Across, "Oh, cry me a river!" (3)

Ross

I believe the answer is:

boo

(Other definitions for boo that I've seen before include "Shout of disapproval, maybe at ref" , "Disapproving jeer" , "Expression of disapproval" , "Show displeasure orally" , "get off!" .)

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