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Oil Midnight Burn I Late Working Big Test

Idiom Burn the Midnight Oil
Example I have a big test tomorrow morning, so I plan to burn the midnight oil tonight.
Meaning to stay up very late at night studying or working
Origin This saying goes back to the days when lamps were lighted by oil and people went to bed earlier than they do today. When you burned the midnight oil in those days, you were up late working or reading by the light of an oil lamp.

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