having a physique or bones as tough as steel; describes a person who is physically very strong or has an exceptionally tough will

(idiom) firm and unyielding; having an upright and courageous character that refuses to bow to pressure; describes someone with a strong backbone

(idiom) strongly built; robust; having a body as tough as copper and iron

Having a physique as strong as iron and a heart full of tender emotions; used to describe a person who is both physically tough or strong-willed and deeply affectionate

A person of upright character and iron will who refuses to yield to pressure or corruption; also written as [[铁骨铮铮|鐵骨錚錚|tie3 gu3 zheng1 zheng1]].