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to phrases
be up onstresses
gen. быть в курсе (+ gen.)
be up on: 131 phrases in 15 subjects
American usage, not spelling1
Bible1
Business2
Cinematography1
Construction3
Criminal law1
Drug-related slang1
General81
Idiomatic1
Informal4
Internet2
Literature1
Makarov29
Programming2
Slang1