What is Risk Of Ruin?

Legal Definition
Risk of ruin is a concept in gambling, insurance, and finance relating to the likelihood of losing all one's capital or impacting one's bankroll to the point that it cannot be recovered. For instance, if someone bets all their money on a simple coin toss, the risk of ruin is 50%. In a multiple-bet scenario, risk of ruin correlates with the number of bets, in which risk increases the longer one plays.
-- Wikipedia
Legal Definition
A risk that is so great that business will not be able to be carried on after it. The loss will exceed profit and the worth of the business.