? variant of STACK sb. 6.
1775. Ann. Reg., Chron., 185. The Abby, having lately gone to pieces on the Stags near Kenrule, in Ireland, the captain, mate, and two common men were cast upon the lower stags.
1867. Smyth, Sailors Word-bk., Stag, a name given to a rock as off the Lizard, Castlehaven, &c.