Definition of "default on" []

• Fail to pay up (verb)

WordNet. Princeton University. 2010.

• "Bemused, he realized that she was truly pleased to have the program done, so that they would not default on a deadline."
• "In fact, noncustodial mothers are 20 percent more likely to default on child support than noncustodial fathers, according to U.S. Census data."
• "Borrowers default on anywhere from 35 percent to 50 percent of all bank loans.39 In a right-side-of-the-J-curve state, a free press could report these problems to the public, and voters would hold elected officials accountable."