"small cage for poultry," mid-14c., from Old English cype, cypa "basket, cask," akin to Middle Dutch kupe, Swedish kupa, and all probably from Latin cupa "tub, cask," from PIE *keup- "hollow mound" (see cup (n.)).
1560s, from coop (n.). Related: Cooped; cooping.
: There were the cats, the milkmen, and the cops cooping in a police car at the corner
fly the coop, hencoop, in the coop, rain cats and dogs
[police senses based on earlier coop, ''any shelter used by the police to avoid the elements''; fr chicken coop]