'Lockup' definitions:

Definition of 'lockup'

From: WordNet
noun
Jail in a local police station
noun
The act of locking something up to protect it [syn: locking, lockup]

Definition of 'Lockup'

From: GCIDE
  • Lockup \Lock"up`\,
  • 1. n. A place where persons under arrest are temporarily locked up; a watchhouse; a jail. [1913 Webster]
  • 2. The act or state of temporary imprisonment in a lockup[1]. [PJC]
  • 3. A malfunction in a machine having moving parts, such that the moving part cannot move; a seizure. [PJC]