返へん信しん用ようの封ふう筒とう

noun

self-addressed stamped envelope; SASE

An envelope provided for the recipient to send a reply, typically with the sender's address and postage already affixed.

• 申もうし込こみ書しょには返へん信しん用ようの封ふう筒とうを同どう封ふうしてください。

  Please enclose a self-addressed stamped envelope with the application form.