狐狸尾巴

1. • lit. fox's tail (idiom) visible sign of evil intentions
2. • to reveal one's evil nature
3. • evidence that reveals the villain

Character by character

• 狐(hú)fox
• 狸(li)used in the names of small mammals
• 尾(wěi)tail
• 巴(ba)Ba, a state during the Zhou dynasty