Definition
to return to a physically demanding task
Examples
1) I know what you mean. Going back to school after a long weekend is like
going back to the salt mines.
2) The boss just announced that we're working overtime this weekend. Back to
the salt mines, everyone!
Etymology
The term has its origins in the harsh working conditions of salt mining,
which were dangerous and unhealthy.
Synonyms
back to the daily slog, back to the grind
- englishdaily626.com [edited]
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The first Sunday after the holidays was gloomy and the heavy thought of going
back to the salt mines hang in the air. King tides flooded the coast and
atmospheric rivers from the northwest bore down on the south bay.
