an iron constitution; muscular; tough and strong ❍ 这些年轻人，通过体力劳动，炼出了一身～。These young people have an iron constitution steeled by manual labour. ❍ 后太宗复封猴行者为铜筋铁骨大圣云。(鲁迅《中国小说史略》99) The emperor gives Monkey the title of Great Saint of Bronze Sinews and Iron Bones.