ruck (1)youdaoicibaDictYouDict[ruck 词源字典]
"A loose scrum formed around a player with the ball on the ground", Middle English (in the sense 'stack of fuel, heap'): apparently of Scandinavian origin; compare with Norwegian ruke 'heap of hay'.[ruck etymology, ruck origin, 英语词源]
ruck (2)youdaoicibaDictYouDict
"Compress or move (cloth or clothing) so that it forms a number of untidy folds or creases", Late 18th century (as a noun): from Old Norse hrukka.
ruck (3)youdaoicibaDictYouDict
"A quarrel or fight, especially a brawl involving several people", 1950s: perhaps a shortened form of ruction or ruckus.