“Double down” comes straight from blackjack—when you double your bet mid-hand,...

https://andersonssuperbthoughtss.timeforchangecounselling.com/why-english-business-language-uses-card-game-terms

“Double down” comes straight from blackjack—when you double your bet mid-hand, confident your next card will win. Learners often misuse it for any tough decision, but it means going all-in, not just trying harder