Meaning of “on the back of an envelope” in the English Dictionary

british dictionary

"on the back of an envelope" in British English

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on the back of an envelope

in a hurried way, without much detail:

The prices were very roughly calculated - it looked as though he'd done them on the back of an envelope.

(Definition of “on the back of an envelope” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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