n. & adj.
--n.
1. a house or room for the temporary detention of prisoners.
2 Brit. non-residential premises etc. that can be locked up, esp. a small shop or storehouse.
3 a the locking up of premises for the night. b the time of doing this.
4 a the unrealizable state of invested capital. b an amount of capital locked up.
--attrib.adj. Brit. that can be locked up (lock-up shop).