Main Entry: ex·pire

Pronunciation: \ik-ˈspī(ə)r, usually for intransitive verb 2 and transitive verb ek-\

Function: verb

Inflected Form(s): ex·pired; ex·pir·ing

intransitive verb

1 : to breathe one's last breath : die
2 : to emit the breath

transitive verb

: to breathe out from or as if from the lungs <the basal metabolism test…measures the amount of carbon dioxide expired by the lungs—J. D. Ratcliff>