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

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

“Double down” comes straight from blackjack: when you’re confident, you double your bet and hope for a good card. Learners often mess this up, thinking it means just “try harder” in any situation. Nope—it’s about backing your bet, not vague effort