一いち二にに及およばず

expression

right away; without delay; immediately

Set phrase meaning to do something without waiting or hesitation; often used when someone acts promptly without needing to be told twice.

• 彼かれは一いち二にに及およばず、すぐに仕し事ごとに取とりかかった。

  He got right to work without waiting around.

• 説せつ明めいを聞きくと、一いち二にに及およばず承しょう諾だくした。

  Upon hearing the explanation, he agreed right away.