common knowledge

"It's common knowledge that really what we're doing is a scam. Most of it is to fool the Ogoni people," the whistle-blower said.

And state law itself contains loopholes that are common knowledge among landlords.

He adds that it is not common knowledge that these statutes are often ignored by prosecutors.

Of course, common knowledge is to roast the bird.

It’s common knowledge, like water is wet, fire is hot, “Joker: Folie à Deux” is a terrible film.