Crossword Genius

Fiercely launch a verbal or physical attack (4,3)

Ross

I believe the answer is:

lash out

(Other definitions for lash out that I've seen before include "fight vigorously" , "spend a fortune" , "Strike (or spend) wildly" , "Attack with blows or words - using whip?" , "Spend lots" .)

I've seen this clue in The Guardian.
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