don't forget to write

間投詞

くだけた表現

(informal) Addressed to someone whose departure is permanent or for a long time

日本語の意味

（長期または永久の別れの際に）手紙（または連絡）を書いて連絡を続けるようにという別れの挨拶

Don't forget to write; you're leaving for good, and I'll miss you.

忘れずに手紙を書いてね。君は永住のために去ってしまうから寂しくなるよ。

意味（1）

(informal) Addressed to someone whose departure is permanent or for a long time