To work or study late into the night.
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To stay up very late working or studying.
When you burn the midnight oil, you sacrifice sleep to get something done.
It often suggests hard work and dedication, though it can also hint at stress or last-minute effort.
"Work Around the Clock"
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Work continuously without stopping, day and night
"Pull an All-nighter"
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Stay awake the entire night to work or study
"Burn the Midnight Oil"
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Work late into the night to get something done