i just want to know how to say 'shut up' in Russian and Italian?
thanks

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I agree with Mike, заткнись- the best match.
But if you want more informal ))) :
закрой рот!
закройся!
завали хлебало!
But I strongly recommend not to use it :) Just for your collection

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'shut up' in Russian - заткнись

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I like better the variant of russian shut the fuck up sounds great
If to a man "Заткнулся нахуй!" if to a woman "Заткнулась нахуй!"

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shut up in italian is  "stai zitto!"  or just   "zitto!"... you can also say "taci!"  but is less colloquial.
byeee,fede

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умолкни / молчи (=keep silence)
тихо (=quiet!)
тсс! (=hush)
закрой рот (=close your mouth)

But i think it's all too rude to use with recently familiar people

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