“Double down” means to commit fully, usually after a bit of risk. At the...

https://idiominsider.com/talking-odds-at-work-the-risk-idioms-every-english-learner-gets-slightly-wrong/

“Double down” means to commit fully, usually after a bit of risk. At the blackjack table, you double your bet hoping the next card seals the win. Learners often misuse it as a caution—actually, it’s about bold, not careful, moves.