This is the 9378th most frequent Japanese word.
磨
"磨" means "to polish" or "to refine."
磨きます (migakimasu): means 'to brush' as in cleaning or polishing, specifically used here for teeth brushing.
彼は毎朝歯を磨きます。
He brushes his teeth every morning.
磨く (migaku): means 'to polish' or 'refine', used metaphorically here for improving skills.
彼女は技術を磨くために毎日練習します。
She practices daily to polish her skills.
磨いて (migaite): means 'to polish', indicating the physical act of polishing to enhance the appearance of the floor.