If something that lasts for a fixed length of time expires, it comes to an end or stops being in use.

My passport expires next month. 我的护照下个月过期。

The contract between the two companies will expire at the end of the year. 两公司之间的合同将在年底到期。

to die

He ceased to breathe, gently expiring without any struggle at the age of 90.

In 1936 the last Tasmanian tiger breathed its final breath and expired in a zoo in Hobart.