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взялся за гуж — не говори bedeutet auf Englisch

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взялся за гуж — не говори

in for a penny, in for a pound(Expressing recognition that one must, having started something, see it through to its end, rather than stopping short thereof)
[UK: ɪn fɔː(r) ə ˈpe.ni ɪn fɔː(r) ə paʊnd] [US: ɪn ˈfɔːr ə ˈpe.ni ɪn ˈfɔːr ə ˈpaʊnd]

не говори «гоп» phrase

don't count your chickens before they're hatched(one should not depend upon a favorable outcome to one's plans until it is certain to occur)
phrase
[UK: dəʊnt kaʊnt jɔː(r) ˈtʃɪkɪnz bɪ.ˈfɔː(r) ˈðeə(r) hætʃt] [US: ˈdoʊnt ˈkaʊnt ˈjɔːr ˈtʃɪkənz bɪ.ˈfɔːr ˈðer ˈhætʃt]

there's many a slip twixt cup and lip(in any situation something can always go wrong)
phrase

и не говори phrase

tell me about itphrase

и не говори! phrase

you can say that again(that is very true)
phrase