"It's a cardinal rule that I attend all school events."

A number of cardinal rules must always be observed.

As you write in your note, this appears to break all the cardinal rules of negotiation.

Not unless they plan to violate one of her cardinal rules.

Completely avoiding the police was one of Mom's cardinal rules.

These are some of the cardinal rules for dealing with the press suggested by advisers: * Say something.

You're ahead by three and your team violates the most cardinal rules in the third period.

My cardinal rule now is: Don't sweat the small stuff.

It was a cardinal rule that no patients were ever to be left unattended.

Over the years, I've hit on three cardinal rules that can help even the most overwhelmed person take control of her life.