chance it
To do something risky; to risk it. The person taking the action is usually aware of the inherent risk. If I were you, I wouldn't chance it—that milk expired days ago! The forecast called for snow, but we decided to chance it and drive up to the cabin anyway.
chance it
Take the risk or hazard of, as in I don't know if there's a later bus but let's chance it. The verb to chance alone was so used for a time, as in Let's just chance the rain-I'm not buying a new umbrella! [Late 1800s] Also see take a chance.