思おもい定さだめる

ichidan verb, transitive verb

make up one's mind; be determined

Expresses a firm decision or resolve, often after deliberation. Slightly literary or emphatic compared to 決める.

• 彼かれは留りゅう学がくすることを思おもい定さだめた。

  He made up his mind to study abroad.

• 一いち度ど思おもい定さだめたら、最さい後ごまでやり遂とげるつもりだ。

  Once I've made up my mind, I intend to see it through to the end.