back–of–the–envelope
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back–of–the–envelope
adjective
back–of–the–envelope
adjective
Learner's definition of BACK–OF–THE–ENVELOPE
always used before a noun
informal
:
done to provide a rough idea of something
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I can't tell you the exact amount, but my back-of-the-envelope [=rough] calculation indicates a cost of about $300,000.
