*Talk back (to) (5,3)
'talk back to' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Another definition for sass that I've seen is " Cheek".)
I've seen this clue in The Wall Street Journal, the Universal, The New York Times, the USA Today, 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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