to welch on a debt (or a deal) 赖账，违约

英文释义

To fail to do what one is required to do in an agreement, such as to pay a debt or to act as promised in the agreement.

例句

The architect worried that the landlords might welch on their deal with him, and so he didn't start the project until their money was deposited in his bank account.

建筑师担心房东违约，所以直到他们把钱存入自己账户才开始动工。