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!
by ManyTreez May 25, 2005
Can you define these popular missing words?
to work diligently, especially late into the night
I had to burn the midnight oil to get that done.
by The Return of Light Joker March 25, 2009