Hide and seek.
1850. As if religion were a game of hide and coop, which the whole city was out playing.S. Judd, Richard Edney, p. 128.
1904. The phrase is found in New Hampshire and in Iowa.Dialect Notes, ii. 418.
1909. M. C. L. of New York says this variant of the hiding game was familiar to American children long before 1850. In hide and coop, each called from his hiding-place a faint, long-drawn c-o-o-p.Notes and Queries, 10 S. xii. 371.