FLOP, v. Suddenly to change one's opinions and go over to another part… — The Devil's Dictionary
SAPIR 861
FLOP, v. Suddenly to change one's opinions and go over to another party. The most notable flop on record was that of Saul of Tarsus, who has been severely criticised as a turn-coat by some of our partisan journals.
Open Scriptures Hebrew Bible (WLC), CC BY 4.0