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Oil Burn Midnight Back Stay Late Working Studying

Idiom (to) burn the midnight oil
Meaning to stay up late working or studying
Example
The bank needs our financial statements completed by 9 a.m. tomorrow. We're going to need to burn the midnight oil tonight to finish on time.

origin: This expression dates back to the days before electricity, when oil lamps were used for lighting. People went to sleep earlier back then, so if you were still burning the oil at midnight, you were staying up late.

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