思おもい及およぶ

godan verb (-bu), intransitive verb

to think of; to hit upon; to realize

Used when one's thoughts reach a certain idea or realization, often after some consideration. Somewhat literary or formal.

• そこまで思おもい及およばなかった。

  I didn't think that far.

• 彼かれはついに真しん実じつに思おもい及およんだ。

  He finally hit upon the truth.