What does the idiom ‘burn the midnight oil’ mean?

Explanation

‘Burn the midnight oil’ is an idiom meaning to work or study late into the night, especially to complete an important task, as in ‘She burned the midnight oil preparing for her final exams.’ The phrase originates from the era before electric lighting, when people literally burned oil in lamps to see well enough to keep working after dark. Explore more English MCQs on mcqstutor to keep practicing.