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投函しなさい

mail it

→ 投函
phrase Uncommon #12,152
mail it A directive meaning “put it in the mailbox.” The しなさい ending gives a command or instruction and is often used by parents, teachers, or other people speaking with authority.
JA: この手紙を今日中に投函しなさい。
EN: Mail this letter by the end of today.

この手紙を忘れずに投函しなさい。

Don't forget to mail this letter.

その手紙をすぐに投函しなさい。

Mail that letter immediately.

必ずこのハガキを投函しなさい。

Be sure to mail this postcard.

明日投函しなさい

Mail it tomorrow.

— セントラル・ステーション (1998)