to write a date on a document, such as a cheque or letter, that is later than the date on which you are writing it, usually to get some advantage在(支票、信件等文件)上把日期填迟;预填…的日期
Luckily, she let me postdate the cheque until the end of the month when I get paid.幸运的是,她让我将支票上的日期填为月底,这样我就可以等拿了工资再付钱了。