0 to rub or brush an object to make it shine, especially a metal or wooden object:
Robert was polishing up some old silver candlesticks.
1 to improve a skill, especially when you have allowed it to become less good over a period of time:
I really must polish up my Japanese before we visit Japan next year.
NYA ORD
European
May 10, 2021
DAGENS ORD
Shimmer
polish sth up