ichidan verb, transitive verb
accomplish; carry out; manage to do
Emphasizes successfully completing something, often after effort or difficulty. Similar to やり遂げる but somewhat more formal or literary.
彼は難しい任務をしおおせた。
He managed to accomplish the difficult mission.
最後までしおおせる自信はありますか。
Are you confident you can carry it through to the end?