expire

die, decease, expire, perish, pass away

这些动词或短语动词均有“死”或“死亡”之意。
die: 最普通用词，指某人或某物失去生命而永远不存在。
decease: 正式用词，多指法律上的用语。
expire: 委婉用词。从本义“从肺部吐出气来”引申为吐出最后一口气，断气而死。
perish: 书面用词，多指夭折或不幸暴亡。
pass away: 是die的委婉用语。

动词 expire:

1. lose validity
   同义词：run out
2. pass from physical life and lose all bodily attributes and functions necessary to sustain life
   同义词：die, decease, perish, go, exit, pass away, pass, kick the bucket, cash in one's chips, buy the farm, conk, give-up the ghost, drop dead, pop off, choke, croak, snuff it
3. expel air
   同义词：exhale, breathe out

1. Our current contract is about to expire, and we'll need to discuss a new one.
   欧文们现有合同快要期满了，需要再谈一个新合同。
2. My passport is due to expire in two months.
   我的护照再过两个月就到期了。

ex.pire

v.（动词）
ex.pired,ex.pir.ing,ex.pires
v.intr.（不及物动词）
To come to an end; terminate:
到达尽头；终止：
例句：
My membership in the club has expired.
我的俱乐部会员资格已期满

To breathe one`s last breath; die:
断气；死亡：
例句：
The patient expired early this morning.
那个患者是凌晨断气的

To exhale; breathe out.
呼气；呼出
v.tr.（及物动词）
To breathe (something) out.
呼出（某物）
Archaic To give (something) off.
【古语】 发出（某物）

来源：
Middle English expiren
中古英语 expiren
from Old French expirer
源自 古法语 expirer
from Latin exspor3re
源自 拉丁语 exspor3re
ex- [ex-]
ex- [前缀，表.从前的，前任的.]
spor3re [to breathe]
spor3re [呼吸]