un·lock / ˌənˈläk/ • v. [tr.] undo the lock of (something) by using a key: he unlocked the door to his room. ∎  make (something previously inaccessible or unexploited) available for use: the campaign has helped us unlock rich reserves of talent among our employees.

unlock (unlock primitive) An indivisible operation by which a process indicates that it has completed its access to a particular resource. See also lock, semaphore.