chance

chance your arm (or luck) undertake something although it may be dangerous or unsuccessful; take a risk. British informal

chance would be a fine thing used to express a belief that something desirable that has just been mentioned is unlikely to happen. informal

fancy your chances: seefancy.

half a chance: seehalf.

in the last chance saloon: seelast.

not a cat in hell's chance: seecat.

not a chance in hell: seehell.

not a Chinaman's chance: seeChinaman.

not a dog's chance: seedog.

not have the ghost of a chance: seeghost.

on the off chance just in case.

1992Neal StephensonSnow Crash They upload staggering quantities of useless information to the database, on the off chance that some of it will eventually be useful.

a sporting chance: seesporting.