“Double down” comes straight from blackjack—when you double your bet after...

https://www.first-bookmarkings.win/double-down-means-to-commit-fully-to-a-risky-choice-from-blackjack-where-you

“Double down” comes straight from blackjack—when you double your bet after seeing your first two cards, betting you’ll win big with your next card. Learners often misuse it to mean “do twice as much” anywhere, losing the original risk-taking vibe