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знать что к чему stresses
gen.	know the how and why of things; know beans; jive; know the score
Игорь Миг	be up to speed on
inf.	know the drill (You know the drill – cut the grass, bag the clippings, and leave them at the curb. Val_Ships)
Makarov.	understand trap
Makarov., slang, amer.	know how many beans make five
proverb	know what's what
saying.	know on which side bread is buttered
slang	know where it's at; where it's at; where the action is
знать, что к чему
gen.	know the ropes (Anglophile); have one's priorities right (Anglophile); know one's way around (Дмитрий_Р); know how many beans make five
Gruzovik	know the how and why of things
Makarov.	know the time of day
proverb	know on which side one's bread is buttered (дословно: Знать, с какой стороны твой хлеб маслом намазан); know on which side one's bread is buttered; know what's what
slang	know what's what
знать, что к чемубукв.: знать, с какой стороны хлеб намазан маслом
Makarov., proverb	know on which side one's bread is buttered

знать, что к чему: 23 phrases in 5 subjects

General	12
Informal	2
Jargon	1
Makarov	7
Proverb	1