expression, godan verb (-ru)
become improved; become polished; gain refinement
Often used when someone's skill, technique, or a product's quality has been honed to a higher level, implying effort or practice behind the improvement.
彼の料理は最近磨きがかかってきた。
His cooking has become more polished lately.
練習を重ねて、彼女
Through repeated practice, her piano playing gained refinement.