as firm(/solid) as a rock; as firm(/secure/stable/steady) as Mount Tai;rock-firm/……似乎他的反动统治从此可以～了。(《毛泽东选集》1145)…as though his reactionary regime had from that moment become as stable as Mount Taishan. ❍ 亮虽居虎口，～。(《三国演义》393) Although I am living in the tiger’s mouth. I am as steady as Mount Tai.
安如泰山an ru tai shan
as solid as Mount Tai
安如泰山ān rú tài shān
牢固得像泰山一样。形容事物非常牢固。as solid as Mount Tai, be safe from all danger, as firm as Mount Tai