Divide risk? (4,3,6)
I believe the answer is:
take the plunge
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for take the plunge that I've seen before include "After much hesitation, decide to do something" , "Decide on bold action" , "Summon up courage" , "Irrevocably commit oneself" , "Commit oneself to a course of action" .)