Meaning of “all-nighter” in the English Dictionary

british dictionary

"all-nighter" in Business English

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all-nighternoun [ C ]

uk us informal

a time when you spend all night working:

When a client presentation loomed, the team would work for 24 hours, and after this all-nighter they'd go out for a celebratory lunch.

(Definition of “all-nighter” from the Cambridge Business English Dictionary © Cambridge University Press)