The idiom 'Burn the midnight oil' signifies 'To work late into the night'. Its origin lies in the pre-electric era, when oil lamps provided light for late-night activities like reading, writing, or studying. The phrase metaphorically represents prolonged work hours, often extending past midnight, to complete an assignment.
Comprehending idioms requires understanding that their meanings are not derived from the literal sense of their constituent words. For this idiom: