Frequency: The word is one of the 3000 most common words in English.
1.
Midnight is twelve o’clock in the middle of the night.
It was well after ~ by the time Anne returned to her apartment...
N-UNCOUNT: usu prep N
2.
Midnight is used to describe something which happens or appears at ~ or in the middle of the night.
It is totally out of the question to postpone the ~ deadline...
ADJ: ADJ n
3.
If someone is burning the ~ oil, they are staying up very late in order to study or do some other work.
Chris is asleep after burning the ~ oil trying to finish his article.
PHRASE: V inflects