あるに任まかせる

expression, ichidan verb

let things take their course; let nature take its course; leave things as they are

Used when one decides not to interfere and accepts whatever outcome arises. Often implies a relaxed or resigned attitude.

• もう計けい画かくを立たてるのはやめて、あるに任まかせよう。

  Let's stop making plans and just let things take their course.

• 結けっ果かはあるに任まかせるしかない。

  We have no choice but to let the outcome be what it will.