What is Burn The Midnight Oil?
1.
To stay up all night working. Apparently some drop the "the", though this must be rare.
Man Bob, you must have really burned the midnight oil on this one!
2.
to work diligently, especially late into the night
I had to burn the midnight oil to get that done.
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1.
A place where, if you take your girlfriend or date late in the evening to buy some porn, you will encounter a creepy older dude with a b..