弥天大祸
      Explanation: Mi: full. Big evil
      Usage: Partial official; as subject, object; described made a big mistake
      Source: Yuan Anonymous "Bowls Ghost": "This is your own clutch of this mortal catastrophe substandard."
      Examples: He realized that he got into ~.
  • Thesaurus:  crowning calamity; be swamped in the vast ocean