Envelop (with the accent on the second syllable) is a verb meaning "cover" or "enclose." Envelope (first syllable accented) is a noun meaning "container used for mailing."
Examples
- A smoky haze from the steel mills used to envelop the city.
- "Letters are expectation packaged in an envelope." (Shana Alexander)
Practice:
(a) "For most men, life is a search for the proper manila _____ in which to get themselves filed." (Clifton Fadiman)
(b) Chaos and calamity continually surround us and threaten to _____ us.

