snail mail
US /ˈsneɪl meɪl/
UK /ˈsneɪl meɪl/

名詞
1.
通常郵便, カタツムリ郵便
the regular postal service, as opposed to email or other electronic communication
例:
•
I sent the documents via snail mail, so they might take a few days to arrive.
書類は通常郵便で送ったので、到着まで数日かかるかもしれません。
•
Even in the age of email, some people still prefer to send invitations by snail mail.
メールの時代になっても、招待状を通常郵便で送ることを好む人もいます。
Lingolandでこの単語を学ぶ