or ~ on
If you ~ something or ~ on it, you practise it or improve your knowledge of it.
I had hoped to ~ my Spanish...
Eleanor spent much of the summer brushing up on her driving.
PHRASAL VERB: V P n (not pron), V P P n
or ~ on
If you ~ something or ~ on it, you practise it or improve your knowledge of it.
I had hoped to ~ my Spanish...
Eleanor spent much of the summer brushing up on her driving.
PHRASAL VERB: V P n (not pron), V P P n
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012