運を天に任せる
運を天に任せること
Trust to chance.
the action of entrusting one's luck to Providence while attempting something
Heaven favours the cause of justice.
運を天に任せるつもりはない。
I don't intend to leave it to chance.
運のいいやつ
The wheel of Fortune turns round.
One's star is in the ascendant.
Fortune's wheel turns round.
a period of time when a person experiences good luck
born into fortunate circumstances