► 動詞磨く  [みがく]    
meaning:  improve  rank: 1☆ 
彼女は
長年技を
磨き続けてきた ⇨ She has been polishing her skills over many years
磨く  [みがく]    
meaning:  polish  rank: 1☆ 
彼女は
靴を磨いた ⇨ She polished her shoes
More examples:- 私は一日に三度歯を磨く ⇨ I brush my teeth three times a day
 - 毎食後歯を磨くのが理想だ ⇨ It is ideal to brush teeth after every meal