clear as mud
一清二楚
口语·表示难以理解或含糊不清
英文释义
not clear or easy to understand
例句
His explanation of the new policy was clear as mud; I still have no idea what to do.
典故来源
源自20世纪初的幽默反讽，字面意思是“像泥巴一样清晰”，实际表示完全不清晰，常用于调侃或讽刺。