SASE
Self-addressed stamped envelope
Example
Please submit your product return with a SASE, which we will use to send back a receipt confirmation of the return
SASE definition by Slang.net
This page explains what the acronym "SASE" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Those discussing mail use SASE to stand for "self-addressed stamped envelope." A SASE is an envelope included in another letter or package, which has the sender's name and address on it and a stamp affixed. The person who received the letter or package can use the SASE to mail an item back to the sender, without paying for postage.
For example, a business offering a rebate to its customers may ask those customers to mail in a receipt, to prove their purchase, and a SASE, which the business can use to send the customer a rebate check. Or, an autograph collector may include a SASE with a request for an autograph, so the celeb they're reaching out to doesn't have to pay to send back their autograph.