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он знает, о чём говоритstresses
gen. he knows what he is talking about
idiom. he surely knows his onions when he speaks about (Coun. Steve Hayes is another councillor whose words are weighty when it comes to Birkenhead's situation. He was taken to the town at age two and he surely knows his onions when he speaks about the town. (YouTube) ART Vancouver)
Makarov. he knows whereof he speaks