Synonyms of brush up on in English:

brush up on

(also brush up)

See definition of brush up

phrase

1‘I've been brushing up on my Italian’

SYNONYMS
revise, read up, go over, refresh one's memory of, relearn, cram, study, learn
improve, sharpen, sharpen up, polish up, better, enhance
hone, refine, fine-tune, perfect
informal rub up, bone up
British informal swot up on, gen up on