envelope
PACKAGING ITEM, USUALLY MADE OF THIN FLAT MATERIAL
Envelopes; Envelope manufacture; ✉; Envelope size; ISO 269; Envelope sizes; No. 10 Envelope; No 10 Envelope; ISO 269:1985; 🖂; Monarch envelope
(envelopes)
1.
An envelope is the rectangular paper cover in which you send a letter to someone through the post.
N-COUNT
2.
If someone pushes the envelope, they do something to a greater degree or in a more extreme way than it has ever been done before.
There's a valuable place for fashion and design that pushes the envelope a bit...
PHRASE: V inflects