return mail noun
Learner's definition of RETURN MAIL
[noncount] US
: mail that answers or responds to something回函 -
We received a lot of return mail after the announcement.通告发布后我们收到了很多回函。
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Fill out the enclosed form and send it back by return mail. [=(Brit) by return of post] [=immediately; as soon as possible]填好信中所附的表格并立即寄回。