be common knowledge

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be common knowledge

To be generally or widely known, whether or not its truth has been verified or officially recognized. It's common knowledge that corporate interests play a major role in directing politicians and the laws they create. The fact that a healthy diet and regular exercise are the best defense against disease is common knowledge at this point.
See also: common, knowledge

be common/public ˈknowledge

be something that everyone knows, especially in a particular community or group: What do you mean you’re surprised he’s leaving? I thought it was common knowledge that he was looking for another job!
See also: common, knowledge, public