古フランス語のjoster「戦う」、馬に乗って戦う、ラテン語のiuxta「近づく」、jungere「結合する」、「結合する」に由来し、語源的にはjoin,jugular,unctureと同じ。
These early tournaments were very rough affairs, in every sense, quite unlike the chivalrous contests of later days; the rival parties fought in groups, and it was considered not only fair but commendable to hold off until you saw some of your adversaries getting tired and then to join in the attack on them; the object was not to break a lance in the most approved style, but frankly to disable as many opponents as possible for the sake of obtaining their horses, arms, and ransoms. [L.F. Salzman, "English Life in the Middle Ages," Oxford, 1950]