work long hours and hard
to be working until late in the night
to work very hard and for long hours into the night
staying awake in the night either studying, reading or working
It is very very hard assignment, and I had to burn the midnight oil to get it completed on time.
The assignment was very lengthy so she was forced to burn the midnight oil to get it done on time.
My brother has a big exam next week so he is already burning the midnight oil. I keep advising him to take it slow.
The assignment is to be submitted first thing in the morning when they get to school so the children are burning the midnight oil
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.