人命关天

Explanation: Off day: metaphor is at stake. Means that the relationship between human life and material things. 　　Usage: The main predicate; as subject, object, attribute, complement; sentences for emphasis 　　Source: Yuan Guan Hanqing "worship the Moon": "To win the groom more selection, te marriage dependents who can not complain. May cause the number to be determined, then this human life." 　　Examples: This is ~ the event, do not effect. Thesaurus:  Self-pity dress