welch
verb [ I ] informal disapproving uk/weltʃ/ /welʃ/ us/weltʃ/ /welʃ/ (also welsh)
食言；（尤指）赖账
to avoid doing something you have promised to do, especially not to pay a debt
He's never welched on a debt - he always pays up. 他从来不赖账——总是会如数还钱的。