Crossword Genius

Really heat up? (4)

Ross

I believe the answer is:

boil

(Other definitions for boil that I've seen before include "7 in water" , "Eruption of the skin" , "Sore with a hard core filled with pus" , "become inflamed" , "Skin swelling; cause to evaporate" .)

I've seen this clue in the Universal.
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