What does burn the midnight oil mean?

What is the definition of burn the midnight oil?

The meaning of "burn the midnight oil" is:
The definition of "burn the midnight oil" is:

(idiom) to go to bed very late and wake up very early to do a lot of work

Example Sentences:

Myriam always burns the midnight oil because she doesn’t plan very well, and has to do all of her work at the last minute.

Rachel burned the midnight oil because she had a presentation to give to her boss.

A: You look terrible, what happened?
B: I’m burning the midnight oil to try and finish my assignment for tomorrow.

From the Blogs:

Sunday Train: Burning the Midnight Oil


burn the midnight oil

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