What does the idiom/phrase "burn the midnight oil" mean?

  1. work or study late at night
  2. waste money
  3. light a lamp
  4. cook food
Answer

A) work or study late at night

Stay up late working. Idioms & Idiomatic Phrases · Common idioms

English MCQ · More English: Idioms & Idiomatic Phrases MCQs · Practise