conker
noun /ˈkɒŋkə(r)/
/ˈkɑːŋkər/
(British English, informal)- enlarge image[countable] the smooth shiny brown nut of the horse chestnut tree
七叶树果 - conkers[uncountable] a children’s game played with conkers on strings, in which two players take turns to try to hit and break each other’s conker
康克戏（儿童游戏，双方用系在绳上的七叶果轮流互击，以击破对方的七叶果）
词源mid 19th cent. (a dialect word denoting a snail shell, with which the game, or a form of it, was originally played): perhaps from conch, but associated with (and frequently spelled) conquer in the 19th and early 20th cents: an alternative name was conquerors.