One of the mysteries of the English language finally explained.
1‘I've been brushing up on my Italian’
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, swot up on, gen up on
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