I don't even see why we need to bring multiple languages into the picture. Different people have (sometimes not so) subtle different understandings of the meani

I don't even see why we need to bring multiple languages into the picture. Different people have (sometimes not so) subtle different understandings of the meanings of different words. By a similar notion of "untranslatability", I feel like similar arguments would basically mean that a single language is untranslatable between two native speakers.