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чья бы корова мычала stresses
gen.	look who's talking!; you're a fine one to talk (Anglophile); you can talk (Anglophile); pot call the kettle black (Сomandor); the devil rebuking sin (Taras); those who live in glass houses should not throw stones (Taras); pot, kettle (ad_notam); people in glass houses (сокращённое от people who live in glass houses shouldn't throw stones ad_notam)
idiom.	i wouldn't be talking (Баян); a fine one to talk (а твоя бы уже молчала Баян); check your privilege (в контексте расового превосходства при рождении, обычно это говорят белым людям kirobite)
inf.	that's rich coming from you (Clepa); that's rich (Clepa); pot calling the kettle black (когда кто-то обвиняет кого-то в чём-то, и сам делает тоже самое vandaniel)
proverb	people who live in glass houses should not throw stones (а твоя молчала Anglophile)
saying.	people who live in glass houses shouldn't throw stones (SirReal)
чья бы корова мычала!
gen.	look who is talking! (Anglophile); you should talk! (seecow)
чья бы корова мычала , а ваша молчала!
amer.	said the pot to the kettle! (Rus_)

чья бы корова мычала: 13 phrases in 5 subjects

Disapproving	1
General	1
Idiomatic	1
Informal	2
Proverb	8