Keywords: don't know
1. Used alone in response to a question to mean that you have absolutely no idea of what the correct answer is. English = 'I don't have a clue.', 'I wouldn't have the foggiest', 'Well?', and so on.
2. Used alone in response to an accusation that you have done something to mean that either you did not do it or that you did not do it and know nothing about it whatsoever. English = 'It's got nothing to do with me.'