Crossword Genius

Become dull (7)

Ross

I believe the answer is:

tarnish

'become dull' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for tarnish that I've seen before include "Spoil" , "Besmirch" , "Go dull" , "(Of metal) lose lustre" , "Take the gloss off" .)

I've seen this clue in The Sun.
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