return mail

noun
🔊/rɪˌtɜːn ˈmeɪl/
🔊/rɪˌtɜːrn ˈmeɪl/
[uncountable] (North American English)
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  1. mail that is sent as a reply or response to something
    • This is where the return mail is received and read.这是接收和阅读回邮邮件的地方。
    • by return mail Please reply to this letter by return mail (= as soon as possible).请通过回信回复此信。