Crossword Genius

Flushes when one exacts revenge (4,4)

Ross

I believe the answer is:

gets even

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'exacts revenge' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Another definition for gets even that I've seen is " Takes revenge".)

I've seen this clue in the Evening Standard.
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