Fàng Hǔ Guī Shān (放虎归山)

Basic Information

Chinese Idiom: 放虎归山

Pinyin: fàng hǔ guī shān

Literal Meaning: Set a tiger free and send it back to the mountains.

Figurative Meaning: Spare a dangerous foe and let them escape, thus leaving hidden troubles and future threats.

 Cultural Background

This is a common cautionary Chinese idiom rooted in ancient military history. Tigers symbolize vicious, formidable enemies in traditional Chinese culture. Releasing a captured tiger means giving a deadly opponent a chance to recuperate and retaliate later. It is widely applied in politics, warfare and daily decision-making to warn against reckless mercy toward dangerous rivals.

 Origin & English Translation

1. Annotation by Pei Songzhi in Records of the Three Kingdoms · Book of Shu · Biography of Liu Ba, quoting Biographies of Wise Men from Lingling:

If we dispatch Liu Bei to campaign against Zhang Lu, we are letting a tiger return to the mountains.

2. From Investiture of the Gods (Chapter 11) by Xu Zhonglin of the Ming Dynasty:

I fear that allowing Ji Chang to return to his fief will prompt Jiang Wenhuan of Eastern Lu and E Shun of Southern Du to raise troops and ravage the realm. Soldiers will suffer from endless warfare, commoners live in panic, and the capital falls into turmoil. This is exactly like freeing a dragon to swim in the sea or letting a tiger go back to the wild mountains; we will surely regret this choice later.

3. Another famous example also involves the warlord Liu Bei, who was given shelter by his rival Cao Cao. Advisors warned Cao Cao to kill Liu Bei immediately, saying:

“Liu Bei is like a tiger. If you let him go back to the mountains, he will gather armies and become a great threat.”

Cao Cao ignored the advice. Later, Liu Bei indeed escaped, built his own kingdom (Shu Han), and became one of Cao Cao’s greatest enemies – exactly as predicted.

4. Similar story happened between King Fuchai and Goujian. Fuchai thought he was being merciful by letting Goujian live. But he had just released a tiger back into the mountains. Eventually, Goujian came back and defeated Wu.

 Usage

Usually derogatory and warning-toned, used to criticize the careless release of dangerous adversaries that will trigger future disasters.

Key Lesson

When you have power over a genuine threat, do not show misplaced mercy. Kindness to a dangerous enemy is cruelty to your future self. The idiom advises decisively eliminating risks while you can — because once the enemy returns to their home ground (their “mountain”), they will be much harder, if not impossible, to defeat again.