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знаток своего дела stresses
gen.	master; top-sawyer; nark; tops; master of his trade (Alexander Demidov); top sawyer; past master; a good hand (at); technician (december19); expert in his field (Belk); connoisseur
Игорь Миг	the real deal
fig.	rockstar (SirReal)
humor.	professor
slang	top gun (Taras)

знаток своего дела: 5 phrases in 3 subjects

General	2
Idiomatic	1
Makarov	2