成なり行ゆきに任まかせる

expression, ichidan verb

leave to chance; let things take their course; go with the flow

Used when one deliberately refrains from controlling a situation and instead lets events unfold naturally. Often implies a relaxed or resigned attitude.

• 結けっ果かは成なり行ゆきに任まかせよう。

  Let's leave the outcome to chance.

• 彼かれは計けい画かくを立たてずに、いつも成なり行ゆきに任まかせる。

  He never makes plans; he always lets things take their course.