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 USA Today, The Wall Street Journal, the Newsday, The New York Times, the Universal and the LA Times.
(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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