With crash gambling, you bank on a multiplier target, such as 1.5 x or 2x

https://blogfreely.net/margaralfs/what-experts-on-csgo-gambling-crash-want-you-to-learn

With crash gambling, you bet on a multiplier target, such as 1.5 x or 2x. If the multiplier never reaches your picked point, your bet is lost; if it does, you can take earnings.