铁桶江山 tiětǒngjiāngshān impregnable state Origin Definitions Defs Strokes Stroke Words Sentences Sents 铁桶 鐵桶 tiětǒng impregnable defense something that is extremely strong, tight, or well-guarded; used to describe a defense or an encirclement that is impossible to break through江山 jiāngshān state power the territory or political power of a nation; the country