A piling up or accumulation; the process or result of gradually building up (e.g., efforts, experience, objects).
毎日の勉強の積み重ねが試験合格につながった。
The accumulation of daily study led to passing the exam.
机の上に本を積み重ねた。
I piled books on the desk.
小さな失敗の積み重ねで自信を失うことがある。
You can lose confidence through a series of small failures.
経験の積み重ねが彼を一人前の職人にした。
A build-up of experience made him a fully qualified craftsman.