To write and accumulate texts (e.g., manuscripts, articles) in advance; to build up a stockpile of writings for future use.
ブログの更新が難しい週のために、記事を書き溜めておいた。
I wrote up articles in advance for weeks when it's hard to update the blog.
小説家はまとまった時間があると短編をたくさん書き溜めることがある。
When novelists have a block of time, they sometimes write and stockpile many short stories.
締切前に原稿を書き溜めておくと安心だ。
It's reassuring to have manuscripts written up before the deadline.
旅行中に日記をたくさん書き溜めた。
I wrote and saved many diary entries while traveling.