chance one's arm

/tʃˈans wˈɒnz ˈɑːm/

/tʃˈæns wˈʌnz ˈɑːɹm/

to chance one's arm

to proceed to do something even though it is risky or unlikely to succeed

Examples

1. Aren't you chancing your arm a bit giving up a secure job to start up a business?

2. Well, it looks like there's an 80% chance your arm is broken.

3. Because there's opposition to writers who chance their arm, imaginatively journey to a world they don't know, but want to know.