push the envelope
To go beyond established limits; to pioneer.
They pushed the envelope on pricing derivatives.
ADJ
fat, thick
self-addressed, stamped addressed
If you want a response, remember to include a self-addressed envelope with your application.
post-paid, pre-paid, reply-paid
She found a pre-paid envelope in the magazine for ordering the special offer.
padded | airmail
brown, buff, manila, plain, white
She slipped the check into a plain white envelope and mailed it that afternoon.
VERB + ENVELOPE
open, rip open, slit open, steam open, tear open
She carefully slit open the envelope to remove the wedding invitation inside.
address, mark
She carefully addressed the envelope to her grandmother's house before dropping it in the mailbox.
seal
ENVELOPE + VERB
contain sth
PREP
in an/the ~
She sealed the document in an envelope before mailing it to the office.
into an/the ~
She carefully placed the birthday card into the envelope before sealing it.
on an/the ~
The postman wrote my name on the envelope before delivering it to my house.
~ of
She carefully opened the envelope of documents from the university this morning.
PHRASES
the back of an envelope
She quickly wrote the address on the back of an envelope before mailing the letter.