'expire' originates from Latin, specifically the word 'exspirare,' where 'ex-' meant 'out' and 'spirare' meant 'to breathe.'

'exspirare' transformed into the Old French word 'expirer,' and eventually became the modern English word 'expire' through Middle English.

Initially, it meant 'to breathe out,' but over time it evolved into its current meaning of 'to come to an end or cease to be valid.'