[run a risk] or [take a risk] {v. phr.}
To be open to danger or loss; put yourself in danger; be unprotected.
* /A baseball umpire wears a mask and chest protector so he won't run the risk of being hit by the ball./* /Billy takes a risk of being hit by a car when he runs into the street without looking./* /I was afraid to run the risk of betting on the game./
Compare: TAKE A CHANCE.