have all the answers
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have all the answersalso know all the answers
to be ready with all the available information about something There's one kid in my class who always has her hand up and always has all the answers. I don't know what can be done - I don't have all the answers, but I do have a lot of questions.
Usage notes: often used to describe someone who wants other people to recognize their intelligence: I used to date someone who had all the answers, and he was such a bore.