back to the salt mines
back to the salt mines {informal}
Back to the job; back to work; back to work that is as hard or as unpleasant as working in a salt mine would be. — An overworked phrase, used humorously.
The lunch hour is over, boys. Back to the salt mines!
"Vacation is over," said Billy. "Back to the salt mines."
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Source: A Dictionary of American Idioms
