Crossword Genius

Simplify, with "down" (4)

Ross

I believe the answer is:

boil

(Other definitions for boil that I've seen before include "7 in water" , "Sore with a hard core filled with pus" , "Abscess" , "Bubble up - inflamed swelling" , "Eruption of the skin" .)

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