To work hard and continuously.
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To work very hard and focus seriously on a task.
When you keep your nose to the grindstone, you stay disciplined and put in consistent effort without getting distracted.
It is used to describe someone who works with dedication and does not let up.
"Burn the Midnight Oil"
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Working very late into the night to get something done
"Pull Your Weight"
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Doing your fair share of work within a group or team
"Nose to the Grindstone"
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Staying focused and working hard consistently without distraction