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Meaning of midnight oil | Babel Free

Noun CEFR B2

Definitions

The drug opium.
slang, uncountable
Used other than figuratively or idiomatically: lamp oil burned at midnight.
uncountable

CEFR level

B2

Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.

See also

midnight regulation midnight run midnight runner midnight snack midnight sun midnight suns