Simple Definition of expire
: to end : to no longer be valid after a period of time
: to die
medical : to breathe out (air)
Examples of expire
My driver's license has expired.
She expired after a long illness.
measuring the volume of air expired from the lungs
Origin of expire
Middle English, from Middle French or Latin; Anglo-French espirer to breathe out, from Latin exspirare, from ex- + spirare to breathe
First Known Use: 15th century
EXPIRE Defined for Kids
Medical Definition of expire
1: to breathe one's last breath : die
2: to emit the breath
: 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>
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