›STOCK MARKETan agreement or period of time during which someone cannot get back the money they have invested: The moment the lock-up ended, the company's founders sold as much stock as they could get away with.lock-up agreement/provision/arrangementManagement were barred from selling shares under the terms of a lock-up agreement until 12 July.Some eurobonds have a lockup period of 90 days before they can be sold.
›UKa building used for storing things safely: He stores the goods in a lock-up he rents near the market.