money advanced for sb. to be paid back later是指“暂替他人垫付钱款”，

advance这里是“垫付”的意思，除此之外，advance在法律文件中常见的还有的意思还有“预先”

如：No amounts are presently owing to any Group Company as a result of any loan or advance made by any Group Company prior to the date of this Agreement（目前不存在由于任何集团公司在本协议签订之日以前提供的任何贷款或预付款而欠付任何集团公司的任何款项）