Definition
To envelop is to wrap something completely — to surround and enclose it until it is hidden inside. Fog envelops a valley, darkness envelops a street, and a smell or a mood can envelop a room. From Old French envoloper, it suggests a soft, total covering that closes in from every side at once rather than a single barrier sliding across. Mind the spelling and stress: the verb envelop (en-VEL-op) has no final 'e', unlike the noun envelope (EN-ve-lope) that you post a letter in.
Examples
Collocations
envelop in darkness·fog enveloped the·enveloped in silence·envelop completely
Synonyms
surround·enclose·engulf·swathe·enfold
Antonyms
expose·uncover·reveal
Word family
enveloping (adjective)·envelopment (noun)
In TOEFL & IELTS
Most useful for descriptive Writing and for TOEFL reading on weather and atmosphere ('clouds envelop the peak'). The one thing examiners and spell-checkers punish is mixing it up with the noun envelope — keep the verb's no-'e' ending and its second-syllable stress.