Obs. [a. F. coy a sinke, or as fosse coye a priuie, jakes, house of office, Cotgr. (lit. quiet or retired ditch.)] ? A sink.
1620. Markham, Farew. Husb. (1625), 68. You shal in the lowest part of the ground (either ioyning vpon some other spoyled ground, or vpon the Sea wall or banke) place a Coy which may either cast the water into the other ground, or else ouer the wall and banke into the Sea.