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In Russian, we don't say "проникнуть в язык" either. It was only used in that movie, in that scene. But I thought it was absolutely clear from the context what "to penetrate" meant there...

P.S....

Well, I'm a bit in an awkward situation here since the American who told me that is one of the forum members. He doesn't write in the forum often, but I know he at least reads it sometimes. Well, I...

Some American, when he saw the word 'penetrate' in some text I wrote, told me that it's not proper American English and he wasn't sure what this word should mean in my sentence. Since then I thought...