Definition of "envelop"

In the fulness of time there was an eruption of the merry-makers to the sidewalk. The uninvited guests enveloped and permeated them, and upon the night air rose joyous cries, congratulations, laughter and unclassified noises born of McGary's oblations to the hymeneal scene.

1906 April, O. Henry [pseudonym; William Sydney Porter], “From the Cabby’s Seat”, in The Four Million, New York, N.Y.: McClure, Phillips & Co, page 165

(b) sporophyte with foot reduced, the entire sporophyte enveloped by the calyptra, which is ± stipitate at the base.

1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, page 4

The Midlanders will hope the victory will kickstart a campaign that looked to have hit the buffers, but the sense of trepidation enveloping the Reebok Stadium heading into the new year underlines the seriousness of the predicament facing Owen Coyle's men.

2011 December 10, Marc Higginson, “Bolton 1 - 2 Aston Villa”, in BBC Sport‎

Then we trundle along a railway enveloped in trees for much of its route, before the river widens, allowing unobstructed views as the line hugs one bank before arriving at Looe, where the single platform is just long enough to fit a two-car Class 150.

2022 November 16, Paul Bigland, “From rural branches to high-speed arteries”, in RAIL, number 970, page 52