Talk back to (4)

'talk back to' is the definition.
(I've seen this in another clue)
This is all the clue.
(Another definition for sass that I've seen is " Cheek".)
I've seen this clue in the Newsday, The Wall Street Journal, the USA Today, the LA Times, The New York Times and the Universal.
(Another definition for mouth off that I've seen is " Forcefully express opinions".)
I've seen this clue in the LA Times.
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