“Double down” hails from blackjack—you double your bet after seeing your cards,...

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

“Double down” hails from blackjack—you double your bet after seeing your cards, hoping for a win. Language learners often trip up by using it for any “risk doubling,” but it’s really about committing more when odds look good. Use it smartly, not loosely.