to hang up (e.g. a coat, a picture on the wall); to let hang; to put on (e.g. a blanket); to put on top of; to put on (glasses, etc.); to wear (a necklace, etc.); to make (a call)
Examples (4 in total)
きみは英語に磨きをかけるべきだ。
You have to polish your English.
ケンは、英語に磨きをかけたいと思っている。
Ken wishes to brush up his English.
彼女は英語をやり直して磨きをかけるために留学した。
She studied abroad in order to brush up her English.