Aielyn said:
Nobody uses "prove" in that way. I've never heard it used to mean "to demonstrate invalidity" in any other sentence. |
and I've never seen a black swan, but nevertheless they exist. whether or not you've come across a particular usage of a term doesn't mean that it doesn't exist, and that is the origin of that expression.
and it's worth knowing because it makes the phrase literally mean the opposite of what it should do. it's like "I could care less" vs "I couldn't care less", the former is incorrect and means the opposite of what is intended.
/rant over