One word, so many meanings.
Secure. In the Navy, it means to stop what you’re doing and tidy up. Or, as the Earth-Bound Misfit put it.
In the Navy, “to secure a building” meant to sweep down the halls, empty the trash, turn out the lights and lock the doors. To the Army, “secure the building” meant to post a guard at the front door. To the Marines, “secure the building” meant to attack the building, blow a hole in the side, go in and kill or capture everyone inside. To the Air Force, “secure a building” meant to negotiate and sign a lease for the building.