v lose validity
v pass from physical life and lose all bodily attributes and functions necessary to sustain life
v expel air
vi. 期满, 呼气, 断气
vt. 呼出
1. Your driver's license will expire next month.
你的驾驶执照下个月到期。
2. The offer will expire if you don't sign up by Friday.
如果你在星期五之前不注册，这个优惠将失效。
3. Always check the expiration date on food products.
始终检查食品的有效期。