Go green, perhaps? (3)

I think it could be either:

rot

dye

(Other definitions for dye that I've seen before include "Colour by dipping in liquid" , "Colouring material" , "Colouring liquid" , "Liquid used to change colour of clothes" , "Colourant" .)

I've seen this clue in the Universal, the LA Times and The New York Times.

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