lock-up option: an option to buy the crown jewels offered to a white knight in order to forestall a hostile takeover
option: the right to buy or sell property at an agreed price; the right is purchased and if it is not exercised by a stated date the money is forfeited
citrus: any of numerous tropical usually thorny evergreen trees of the genus Citrus having leathery evergreen leaves and widely cultivated for their juicy edible fruits having leathery aromatic rinds