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English definition of “expire”

expire

verb [I]     /ɪkˈspaɪər/
to come to an end after a fixed length of time: a contract/lease/licence expires This offer expires on 31 March 2012.set/scheduled/due to expire The warranty period is due to expire at the end of November. Under current law, the state's earned-income tax credit would expire after this year.
FINANCE, STOCK MARKET if an option (= the right to buy or sell particular shares) expires, it can no longer be exercised (= used): The investment options expire on February 5.
(Definition of expire verb from the Cambridge Business English Dictionary © Cambridge University Press)
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