Back-of-the-envelope

From Fresh Dictionary

English

Adjective

back-of-the-envelope

1. ((idiomatic{{#if:|, {{{2}}}{{#if:|, {{{3}}}{{#if:|, {{{4}}}{{#if:|, {{{5}}}{{#if:|, {{{6}}}{{#if:|, {{{7}}}{{#if:|, {{{8}}}{{#if:|, {{{9}}}}}}}}}}}}}}}}}}})) approximate, rough, simplified

   Example: Do some back-of-the-envelope calculations before all the facts come in.