Green’s Dictionary of Slang

coop v.

[coop n.1 (2)/coop n.1 (3)]

1. (US) to stay, to hide.

[US]E.L. Wheeler Deadwood Dick in Beadle’s Half Dime Library I:1 80/1: The ‘toughs’ are after you, and you can’t find a better place to coop than in here.
[US]J.A. Riis How the Other Half Lives 57: The impulse that makes the Polish Jew coop himself up in his den with the thermometer at stewing heat.
[US]Ade Forty Modern Fables 254: William remembered what Pa had said, so he cooped himself up in his Room and became a Dig.

2. (US) to imprison.

[US]Nat. Police Gaz. (NY) : Policeman Stine in Quod [...] His wife, Mrs. Stine, got mad because he ran away with [...] a pretty and buxom grass widow, and scooted to Tower Hill, and she therefore had him cooped.

3. (US police, esp. N.Y.) to sleep or rest while on duty – in a motel room or similar hideaway; thus cooping, sleeping or resting while on duty.

[US](con. 1900s) C.W. Willemse Cop Remembers 137: I’m not telling this to prove the merits of ‘cooping,’ but it has its good as well as its bad aspects. [...] under the two platoon system it was almost impossible in a busy precinct to get a moment’s relaxation while on reserve. The Station Houses were noisy, filthy, vermin-ridden and foul and a clean bed somewhere on post was preferable to a bed behind the green lights.
[US]R. Dougherty Commissioner 33: Random stops were made to see if a given post was covered or if the cop assigned was ‘cooped’.
[US]E. Droge Patrolman 85: He told me a couple of places where I could eat [...] and a couple of places where I could ‘coop,’ or lay up.
[US]H. Gould Fort Apache, The Bronx 133: This might cut into their cooping time a little.
[US]M. McAlary Crack War (1991) 20: A far greater transgression was cooping, falling asleep on the job.
[US]D. Winslow The Force [ebook] Malone scans for [...] some cops cooping in a radio car.
[US]A. Schulman 23rd Precinct 35: Another team let Central know that they were responding to a job, but stopped and got coffee or a sandwich first. A few cops identified the cooping locations and used them.