春冰虎尾

Explanation: Stepping on the tiger tail, walking in the spring thaw the ice. Metaphor of the situation is very dangerous. 　　Source: "Shangshu Jun teeth" in fear for heart risk, if dance Huwei, involving in the spring ice. " 　　Examples: Yanguang other Shenyan Artemisia ~ Ring of evil, want to surprise on the meaning enlightenment. (Song Sun Guangxian "Bei" Volume XX)