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brush up onstresses
gen. подучивать (ammoncheskin); отточить (навыки Olga_Lari)
idiom. совершенствовать (например: Mary had to brush up on her Spanish before going to South America. Acruxia); дорабатывать (Acruxia)
inf. освежить свои знания (just to set things straight, this means "to refresh one's memory, renew one's skill", e.g.: "Want to brush up on a foreign language? With these materials, it's easy to maintain and sharpen your foreign-language skills." ART Vancouver); натореть (Abysslooker); поднатореть (Abysslooker)
brush up on: 6 phrases in 4 subjects
Education1
General1
Human resources2
Makarov2