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).