Lip, or mouth off to (4)

I believe the answer is:

sass

I believe this is a double definition.

'lip' is the first definition.
(I know that lip can be written as sass)

'mouth off to' is the second definition.
(I've seen this in another clue)

(Another definition for sass that I've seen is " Cheek".)

I've seen this clue in the Universal.

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