Crossword Genius

Decisive blow (4)

Ross

I believe the answer is:

kayo

'decisive blow' is the definition.
(a KO, a knock-out)

This is the entire clue.

(Other definitions for kayo that I've seen before include "Stun" , "To render senseless" , "Knockout" , "Fight's ending" , "floor" .)

I've seen this clue in The Guardian.
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