国士無双

こくしむそう

noun

distinguished person(yojijukugo)

thirteen orphans, winning hand containing one of each terminal and honor tile plus one extra copy of any of them(mahjong term)

国	country
士	gentleman, scholar, samurai, samurai radical (no. 33)
無	nothingness, none, ain't, nothing, nil, not
双	pair, set, comparison, counter for pairs