subs. (thieves).A prison. For synonyms, see CAGE.
1866. The London Miscellany, 3 March, p. 57, col. 3, London Revelations. I dont think thats no little let-down for a cove as has been tip-topper in his time, and smelt the insides of all the COOPS in the three kingdoms.
1877. GREENWOOD, Dick Temple. You say that you have been in the COOP as many times as I have.