*Talk back (to) (5,3)
'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 New York Times, the Universal, the LA Times and the Newsday.
(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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