Coop is a general term meaning a something to confine, or to contain. Formerly the word coop was used for a cask or barrel to contain liquids. The Germans still use kupe for a tub or vat, and kupfer for one who makes tubs. We still say cooper for a tub-maker, and the word coop, a tub, still remains in our dictionaries, but it is not used.
- Eliezer Edward's Words, Facts, and Phrases: A Dictionary of Curious Matters, 1882