usually you would say "I'm sorry?" as a question, or "I'm sorry, I don't understand" if you wan't someone to repeat what they said" Usually just asking "What?" on it's own is rude saying "What is it?" or "What's wrong" is not rude, just try not to ask "What?"
The Language Level symbol shows a user's proficiency in the languages they're interested in. Setting your Language Level helps other users provide you with answers that aren't too complex or too simple.
Has difficulty understanding even short answers in this language.
Can ask simple questions and can understand simple answers.
Can ask all types of general questions and can understand longer answers.
Can understand long, complex answers.
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