develop: [17] The history of develop and its close relative envelop is hazy. English acquired it from développer, the modern French descendant of Old French desveloper. This was a compound verb formed from the prefix des- ‘un-’ and voloper ‘wrap’. But where did voloper come from? Some have proposed a hypothetical Celtic base *vol- ‘roll’, while others have pointed to similarities, formal and semantic, with Italian viluppo ‘bundle’ and viluppare ‘wrap’, which come from an assumed late Latin *faluppa ‘husk’. Beyond that, however, the trail has gone cold. => envelop[develop etymology, develop origin, 英语词源]