[] () a guarantee provided by a bank or an insurance company that their customer, for example a supplier or a building company, who has a contract to supply sth or do some work for sb will complete the work. If they do not, a sum of money will be paid. 履约保函，承包保证书﹝保证人（银行或保险公司）向担保申请人（如供应商或建筑公司）提供的担保，如果申请人不履行与受益人订立的合同，保证人负责付款给受益人﹞◆The contractor must provide a contract bond. 承包商必须提供履约保函。◆A performance bond is a financial guarantee that you will honour a business contract. 履约保函是你将履行商务合同的财务担保。