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понимать толк вstresses
gen. show discrimination in (чем-либо)
Makarov. show discrimination in something (чем-либо); be a good judge of something (чем-либо); know what is what (чём-либо)
понимать толк в чём-л.
idiom. know one's onions (The expression "know one's onions" means to be very knowledgeable or experienced about something, to know a great deal about a particular subject. (Collins Dictionary) The origin is Cockney rhyming slang: onions = onions rings = things.: He knows his onions. -- Он знает / понимает толк в этих делах. ART Vancouver)
понимать толк в: 5 phrases in 3 subjects
General3
Informal1
Literature1