N-SING (贴足邮资写明发信人姓名及地址的)回邮信封 An SASE is an envelope on which you have stuck a stamp and written your own name and address. You send it to a person or organization so that they can reply to you in it. SASE is an abbreviation for 'self-addressed stamped envelope'. (贴足邮资写明发信人姓名及地址的)回邮信封 [US]