单词 | midnight oil |
释义 | midnight oilfigurative noun Laborious or extra effort, as in studying late at night; usually in to burn (etc.) the midnight oil: to sit up or work (as by lamplight) late into the night, to work diligently or conscientiously. OriginMid 17th century; earliest use found in Francis Quarles (1592–1644), poet. |
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