= expiry
an ending of the period of time when an official document can be used, or when an agreement is valid （文件、协议等的）满期，届期，到期
the expiry of a fixed-term contract
定期合同的满期
The licence can be renewed on expiry.
执照期满时可延期。
告终;期满;截止；The expiration of a fixed period of time is its ending. [oft the N of n] [Formal]
//…a few hours before the expiration of the midnight deadline.
午夜最后期限截止前的几个小时