What is the meaning of the idiom **"Burn the midnight oil"**?

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**Solution:**

1. The idiom **"Burn the midnight oil"** means to work late into the night or to study or work hard during late hours.

2. Historically, it refers to the time when people used oil lamps to work or study after dark.

3. Among the given options, the correct meaning is **"To work late into the night"**.

**Answer:** To work late into the night

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