vi.

1. 滿期，屆期；（期限）終止
   My lease will expire on September 30th of this year.

   我的租約今年九月三十日到期。

2. 呼氣，吐氣
3. 【書】斷氣，死亡
   The old lady expired within the hour.

   那個老太太不到一小時就死了。

vt.

1. 呼出（空氣）
   We expire used air from our lungs.

   我們從肺裡呼出廢氣。

v.

1. (of a document or agreement) come to the end of the period of validity.
   ▸(of a period of time) come to an end.
2. (of a person) die.
3. technical exhale (air) from the lungs.