“Double down” comes straight from blackjack: when you’re confident, you double...

https://www.save-bookmarks.win/double-down-comes-from-blackjack-where-you-double-your-bet-after-seeing-your

“Double down” comes straight from blackjack: when you’re confident, you double your bet and hope for a lucky card. Learners often misuse it as just “doubling effort,” but it’s about risk—betting more when the stakes look good, not simply trying harder.