Allowing more things through, if I understand your analogy correctly in this case, is broadening the exceptions -- things not matched by the definition.

But, I'll bite, let's dive in. In a Venn diagram, substances with a minimum of 2 fully fluorinated carbon atoms is a subset of substances with a minimum of 1fully fluorinated carbon atoms, yes? Similarly, M&Ms with only red and green colors is a subset of M&Ms of any color, yes? If a person was to change their personal definition of acceptable M&Ms from any color to only red and/or green, would you call that broadening that definition?