"Double down" started at the blackjack table—you're doubling your bet with just...

https://dlf-ne.org/is-up-the-ante-a-gambling-term-unpacking-a-classic-business-idiom/

"Double down" started at the blackjack table—you're doubling your bet with just one more card, hoping for a lucky break. Learners often misuse it to mean "try harder," but it’s really about risking more when you already have skin in the game