To become invalid after a set time.

• Used of documents, policies, licenses, or offers.

To die; to pass away. (formal)

• Euphemistic or literary use.

To come to an end.

• Of a period, term, or time limit.

To breathe out; to exhale.

• To let air out of the lungs.

To emit gradually as vapor or gas.

• To give off in minute particles.

To cause to become invalid; to terminate. (technical)

• To set an item to expire.