expire
verb [ I ]
uk/ɪkˈspaɪər/ usto 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.