as clear as mud spokenused humorously to say that something is very difficult to understand一点都搞不懂，极难理解〔幽默用法〕⇒ALL CLEAR⇒the coast is clear at COAST¹ (2)—clearness noun U as clear as mud 见MUD. as clear as mud informal not at all easy to understand 〈非正式〉难以弄清楚, 使人莫名其妙。 |