round robin (n.)youdaoicibaDictYouDict[round robin 词源字典]
"petition or complaint signed in a circle to disguise the order in which names were affixed and prevent ringleaders from being identified," 1730, originally in reference to sailors and frequently identified as a nautical term. As a kind of tournament in which each player plays the others, it is recorded from 1895.[round robin etymology, round robin origin, 英语词源]