It's used in multiple senses, so it's almost impossible to tell what the person using it means. https://en.wikipedia.org/wiki/Exception_that_proves_the_rule?wp

It's used in multiple senses, so it's almost impossible to tell what the person using it means. https://en.wikipedia.org/wiki/Exception_that_proves_the_rule?wprov=sfla1 https://en.wikipedia.org/wiki/Exception_that_proves_the_rule...