simple past tense and past participle of expire
"The tickets have expired, so we cannot enter the concert anymore."
In plain English: To expire means to reach an end date and stop being valid, effective, or alive.
"The milk has expired, so we should throw it away."
having come to an end or become void after passage of a period of time
"an expired passport"
"caught driving with an expired license"
that is no longer valid
"The driver's license has expired and is no longer valid for driving on public roads."