Exactly!
“How many legs does a dog have if you call his tail a leg? Four. Saying that a tail is a leg doesn’t make it a leg”
-Abraham Lincoln
That is how a “tail” becomes a “leg” and how “negligence” becomes “carelessness”
Or in the famous words of Humpty Dumpty:
“When I use a word, Humpty Dumpty said, in rather a scornful tone, it means just what I choose it to meanneither more nor less.