back–of–the–envelope

adjective

Definition of back–of–the–envelope

  1. :  done quickly to provide a rough estimate :  not exact did a back-of-the-envelope calculation His method is, in effect, a back-of-the-envelope time-and-motion study. — Ian Stewart

1968

First Known Use of back–of–the–envelope

1968


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a trip made at another's expense

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