to wrap up in or as in a covering

The long cloak she was wearing enveloped her completely.

to serve as a wrapping or covering for, as a membrane of an organ or a sheath.

to surround entirely.

Military . to attack (an enemy's flank).

envelope.

verb

free , let go , let loose , open , release , uncover , unwrap

verb

blanket , cage , cloak , conceal , contain , coop , corral , cover , drape , embrace , encircle , enclose , encompass , enfold , engulf , enshroud , enwrap , fence , gird , girdle , guard , hem , immure , invest , obscure , overlay , overspread , pen , protect , roll , sheathe , shield , shroud , shut in , superimpose , surround , swaddle , swathe , veil , wrap , wrap upnotes:envelop is the verb; envelope is the noun , infold , wrap up , clothe , besiege , close in , hedge , cocoon , encase , envelope , environ , hide , inclose , inwrap , mask , overlie , sheath