expression, godan verb (-mu)
accumulate practice; put in practice; train extensively
Emphasizes building up experience through repeated, sustained practice over time. Often used when describing a long-term effort to improve a skill.
彼は毎日ピアノの練習を積んでいる。
He practices the piano every day, steadily building his skill.
試合に勝つために、十分
To win the match, you need to put in enough practice.