念ねんを入いれる

expression, ichidan verb

take great care; pay careful attention; be meticulous

Used when someone puts extra thought, effort, or caution into an action, often to avoid mistakes or ensure quality.

• 大だい事じな書しょ類るいだから、念ねんを入いれて確かく認にんした。

  Since it's an important document, I checked it with great care.

• 彼かれは念ねんを入いれて準じゅん備びをしたので、発はっ表ぴょうは成せい功こうした。

  He prepared meticulously, so his presentation was a success.