BT Ket 69b(38) :תלא נפשיה באיסקריא דספינתא נפילנא מאיסקריא וטבענא‏ : he suspended himself from the sailyard of the boat (and said:) ... "I am going to jump off the sailyard and drown"
See the entire entry for ˀsqryˀ#2 n.m. mast, sailyard of a ship