書き下ろす

かきおろす

to write (a new novel, play, song, etc.); to write (an original work for a specific purpose); to write specially (for)

Also written 書下ろす

Meanings

Godan verb (-su), Transitive
to write (a new novel, play, song, etc.); to write (an original work for a specific purpose); to write specially (for)

トムが書かき下おろしたもの全すべてをフランス語ごに翻訳ほんやくしました。

I translated everything Tom wrote into French.
日本語にほんごを扱あつかう場合ばあいにも応用おうようできるように、訳者やくしゃのひとりである萩原はぎはら正人が、日本にほん向むけに原書げんしょにはない12章しょうを書かき下おろしました。

In order to put into application the case of treating Japanese, Masato Hagiwara all by himself wrote an additional chapter 12 for Japan that is not in the original book.