Words to a backstabber (2,2)

I think it could be either:

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2,2

et tu

'words to a backstabber' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for et tu that I've seen before include ""___, Brute!" (Julius Caesar)" , "Brute follows these words" .)

I've seen this clue in The Wall Street Journal and the King Feature Syndicate.

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