鐵桶江山

Simplified: 铁桶江山

tiětǒngjiāngshān ㄊㄧㄝˇ ㄊㄨㄥˇ ㄐㄧㄤ ㄕㄢ

    • power or sphere of influence so firmly held it cannot be shaken

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
an iron-bucket realm
Meaning
Political power or a sphere of influence so firmly held that it cannot be shaken. Slightly literary.

Sources