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не учи учёного stresses
gen.	never offer to teach fish to swim; do not teach a pike to swim, a pike knows his own science; don't teach a pike to swim, a pike knows his own science
brit.	don't teach your grandmother to suck eggs (Anglophile)
idiom.	not my first rodeo (It's not my first rodeo. I know how contracts work Taras)
inf.	go teach your grandmother to suck eggs (OlCher); go suck eggs (OlCher); you can't kid a kidder (Motya)
proverb	don't try to teach your grandma to suck eggs; don't teach fishes to swim; don't teach your grandmother to suck eggs; don't teach a fish to swim; advice when most needed is least beeded
slang	don't bullshit a bullshitter (Wolverin); don't shit a shitter (Ufel Trabel)

не учи учёного: 1 phrase in 1 subject

General

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