Definition of lockup:
locking, calaboose, joint, free, slammer, tolbooth, nick, tank, house of correction, bridewell, pokey, police station, big house, cop shop, hock, can, quod, hoosegow, station house, slam, precinct, stir, hold, guardroom, clink.
prison (part of speech: noun)
- reform school,
- penal colony,
- San Quentin,
- straight jacket,
- "Do and Dare A Brave Boy's Fight for Fortune", Horatio Alger, Jr..
- "Journeys Through Bookland V2", Charles H. Sylvester.
- "Maximina", Armando Palacio Valdés.