The term comes from the card game Blackjack when a player doubles the bid in exchange for one more card to be drawn. Politically, it means to become more tenacious, zealous, or resolute in a position or undertaking, particularly if it is risky. It seems to be ever more common, as if everyone is deathly afraid of backing down, even if the road ahead is full of traps.
I have made a number of mistakes in my life, but I have rarely been persistent in my errors. True, I might have become a soulless millionaire instead of a mere survivor. But, in my book, surviving is a good thing.
For people like Vladimir Putin or Donald J. Trump, surrender is never an option. Trump may well wind up in prison, and it is entirely possible for Putin to be forcibly escorted out of the Kremlin. But for the time being, they will remain resolute as if they were immortal and all-powerful—which they aren’t.