lockup

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Informal A jail, especially one in which offenders are held while awaiting a court hearing.
• noun The act or an instance of locking.
• noun The state of being locked.

from The Century Dictionary.

• noun The act of locking up, or the state of being locked up. See to lock up, under lock, transitive verb
• noun A room or place in which persons under arrest are temporarily confined.

from the GNU version of the Collaborative International Dictionary of English.

• noun A place where persons under arrest are temporarily locked up; a watchhouse; a jail.
• The act or state of temporary imprisonment in a lockup{1}.
• A malfunction in a machine having moving parts, such that the moving part cannot move; a seizure.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun slang A jail, prison.
• noun UK A storage unit with a door secured by a padlock or deadbolt; a garage

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun jail in a local police station
• noun the act of locking something up to protect it
• verb secure by locking
• verb place in a place where something cannot be removed or someone cannot escape