Is there a word for mistaken use of a set phrase?
For example, I heard an interview with an athlete in which he said "...you have to celebrate the victory of your spoils." Of course, this is not how the expression is commonly used (as I understand, it began with "to the victor belong the spoils" and has morphed into "the spoils of victory"; perhaps the phenomenon I'm looking to name is one of the drivers of such evolution).
I don't believe we can use misquote, because I'm talking about phrases that have entered the general public vocabulary. Nor is it a play on words, because it is unintentional. I realize we can just call it a mistake, so please don't suggest something as non-specific as that. I'm looking for a mistake with a set phrase.