vulgar corruption of CHAISE [as if this had been a plural word chay-s; cf. cherry, Chinee, pea]; cf. also SHAY.
1764. Foote, Mayor of G., I. i. Theres Mr. Sneak keeps my sister a chay.
1771. Mackenzie, Man Feel., xxxiii. (1803), 56. The pleasure of keeping a chay of ones own.
1814. Mad. DArblay, Wanderer, III. 77. You know our chay-cart of old.
1839. Dickens, Tuggss at Ramsg., Sk. Boz, 369. How shall we go? A chay? suggested Mr. Joseph Tuggs. Chaise, whispered Mr. Cymon. I should think one would be enough, said Mr. Joseph. However, two chays, if you like.