履薄临深

Explanation: Metaphor at risk, must be very careful. 　　Usage: Joint type; as predicate; metaphor at risk, be very careful 　　Source: "Little Book of Xiao Ya Min": "fear and trepidation, immersive abyss, treading on thin ice." Thesaurus:  put a fire under a pile of faggots— a hidden danger, a blind man on a blind horse— — rushing headlong to disaster, (literally) to walk on ice--cautious Pro Yuan, A deep discharge thin, toward Less evening, sit without approaching the stair way, a blind man on a blind horse— — rushing headlong to disaster