Толковый словарь английского языка Oxford English Reference - jag

1. n. & v. --n. a sharp projection of rock etc. --v.tr. (jagged, jagging) 1 cut or tear unevenly. 2 make indentations in. Derivatives jagger n. Etymology: ME, prob. imit. 2. n. sl. 1 a drinking bout; a spree. 2 a period of indulgence in an activity, emotion, etc. Etymology: orig. 16th c., = load for one horse: orig. unkn.