zhǐ shān shuō mò
比喻错此说彼。
明 兰陵笑笑生《金瓶梅词话》第十回:“如何远打周折,指山说磨,拿人家来比。”
指山说磨连动式;作主语、谓语;含贬义。
point to a hill and talk about grindstone--make concealed reference to something