念には念を入れる ねんにはねんをいれる to be extremely cautious; to be as sure as sure can be; to make assurance doubly sure exp v1 id Advanced ➥
念には念を入れる ねんにはねんをいれる to be extremely cautious; to be as sure as sure can be; to make assurance doubly sure exp v1 id Advanced ➥