From Longman Dictionary of Contemporary Englishit is (not) for somebody to do somethingit is (not) for somebody to do somethingused to say whether it is someone’s right or duty to do something It’s not for me to tell you what to do. It will be for you to decide what action you should take. → for
Examples from the Corpus
it is (not) for somebody to do something• If one can notice the absence of something one must already know what it is for things to be absent.• All the work in this approach must go into a persuasive account of what it is for reasons to be conclusive.• How important it is for them to build theories out of what they see and think.• Look how difficult it is for women to get on in the medical or legal profession!• I can tell him how important it is for us to have a home of our own. 