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

https://telegra.ph/What-Are-The-Myths-And-Facts-Behind-CS2-Crash-Site-09-18

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