“Double down” means to commit fully to a risky choice, from blackjack where you...

https://www.4shared.com/office/12SjSzBTge/pdf-11845-28864.html

“Double down” means to commit fully to a risky choice, from blackjack where you double your bet for one last card. Learners often think it’s about hesitation or withdrawing—actually, it’s doubling effort, not backing off