|the child of a first cousin of either of one's parents|
|a fool or simpleton; ninny.|
|a gadget; dingus; thingumbob.|
Something that is related or similar but not quite the same, as in This beef stew is second cousin to boeuf bourguignon. This expression transfers the literal sense of second cousinthat is, the child of the first cousin of one's mother or fathera usage dating from the mid-1600s.