弥天大谎

Explanation: Mortal: sky. Describe the big lie. 　　Usage: Partial official; as object; describe the absurd lie 　　Source: Yuan Wang Bocheng "Li Bai derogatory Yelang": "that fellow heart of the main house set given disorder, brewing in the sky lie." 　　Examples: "Who spread the ~ ah," fat wife said: "It can be utterly devoid of conscience ah!" (Feng Deying "Spring Flowers" Chapter XIV) Thesaurus:  doublespeak, Big fan of lying, monstrous lie, whopper, Charming eyes, Monstrous Big panic