Crossword Genius

Signal to stop, say (4)

Ross

I believe the answer is:

hail

(Other definitions for hail that I've seen before include "Say hello to the ice pellets" , "Fall of ice" , "Greet(ing) - frozen shower" , "Old Roman salute, or frozen pellets" , "come down hard" .)

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