三人成虎
sān rén chéng hǔ three people make a tigerThree people all saying there is a tiger in the marketplace produces a tiger — even though everyone knows the marketplace has no tigers. A minister warns his king, is warned himself, and the king still fails. The story's power is its ending: knowing the mechanism does not protect you from it.
The Story · 故事 gùshi
庞葱 (Páng Cōng) was a minister of the state of Wei during the Warring States period. He was about to leave the capital, Daliang, to accompany the crown prince to the state of Zhao, where the prince would live as a political hostage — a common diplomatic arrangement of the era. Before departing, he went to the Wei king and posed three questions.
"If one man comes to Your Majesty and says there is a tiger in the marketplace — do you believe him?"
The king said: "No."
"If two men say it?"
"I would begin to doubt."
"If three men say it?"
"I would believe it."
Pang Cong said: "The marketplace clearly has no tiger. Everyone knows this. But three men saying so creates a tiger. Now I am going to Zhao, which is much farther from Your Majesty than the marketplace. And many people will come to speak against me in my absence. I ask you to think carefully about what you hear."
The king assured him: "I understand. I will decide for myself."
When Pang Cong returned from Zhao, the king refused to see him.
夫市之无虎明矣，然而三人言而成虎。今邯郸去大梁也远于市，而议臣者过于三人矣，愿王察之矣。
The marketplace clearly has no tiger — this is obvious. Yet three men saying so creates a tiger. Now Handan is farther from Daliang than the marketplace, and those who will speak against me are more than three. I ask you to examine what you hear carefully.
The story's ending is the point. Pang Cong understood the mechanism precisely. He named it to the king. The king agreed. And the king still succumbed. Three voices, repeating a false claim, overwrite what you know to be true — even when you have been warned in advance.
Character Breakdown · 字解 zì jiě
三 is not an exact count here. In classical Chinese, 三 (three), 九 (nine), and 百 (hundred) are conventional numbers used to mean "several," "many," or "a critical mass." The idiom is not saying that precisely three witnesses produce belief. It is saying: a sufficient number of voices, repeating the same claim, will produce belief regardless of the claim's truth. The choice of 三 over 二 (two) or 十 (ten) reflects the conversational structure of the anecdote — one did not convince, two created doubt, three closed the question.
人 here means individual witnesses — distinct people offering independent-seeming testimony. The implicit argument is that three separate reports feel like corroboration. In practice they may not be: if one person's claim spreads, the people who repeat it are not independent witnesses. They are transmitting the same original false report. The original story does not address this, but later discussions of 三人成虎 have focused on this point as especially relevant to rumor and media.
成 means to become, to accomplish, to constitute. Its use here is causative: the three people do not merely report a tiger, they produce one. The tiger comes into being — as an object of belief, as a social fact — through the accumulation of reports. This is a precise formulation: the tiger is not in the marketplace, but the tiger is now real as a thing the king believes in.
虎 is chosen because a tiger in the marketplace is obviously impossible. The Warring States marketplace was a densely populated, tightly regulated urban space — not a place where a large predator would go unnoticed or where its presence would be plausible. The implausibility is the point: if three voices can produce belief in something this absurd, they can produce belief in anything.
What the Idiom Argues · 含义 hányì
三人成虎 is one of the classical Chinese texts most frequently cited in discussions of epistemology and social psychology. The story identifies something that is now studied under headings like "social proof," "cascade effects," and "the availability heuristic" — the tendency to estimate the probability of something by how easily examples come to mind.
The story's sophistication lies in its ending. Pang Cong does not simply identify the problem — he demonstrates it in advance to someone who then fails to avoid it. The king is not described as foolish. He listens, he agrees, he promises to reflect. He fails anyway. This is not a story about gullibility. It is a story about the structural power of accumulated testimony over individual judgment, operating even on a person who has been warned and who intellectually understands the mechanism.
The Wei king's failure is not a failure of intelligence. It is a failure of the position of listener: when enough people tell you the same thing, the social weight of their agreement overrides your individual capacity to resist. Pang Cong could name the process and still could not protect himself from it.
This is why 三人成虎 has proven so durable. It is not a simple warning against credulity. It is a recognition that the mechanism is structural, not personal — and therefore very difficult to defeat by individual resolution alone.
Usage and Register · 用法 yòngfǎ
三人成虎 is used in educated speech and writing. It is not casual — its classical source is known, and using it signals familiarity with the Zhanguo Ce tradition. The idiom appears in journalism, in media criticism, in academic discussions of cognition and social influence, and increasingly in commentary about online information environments.
In the social media context, the phrase acquires new precision: platforms allow a single false claim to be repeated by thousands of apparently independent voices, accelerating the mechanism the original story describes. A claim that would have required three coordinated people to spread in the Warring States period now spreads through algorithmic amplification, with each share appearing to be independent corroboration.
三人成虎 is almost always used as a warning or a diagnosis. It does not have an ironic or self-deprecating register. You use it to name a process you see happening — in public discourse, in an organization, in a rumor cycle — and to invite skepticism about the accumulated testimony.
三人成虎，我们不能轻信网络上未经核实的消息。(Sān rén chéng hǔ, wǒmen bù néng qīngxìn wǎngluò shàng wèijīng héshí de xiāoxi.) — Three people make a tiger; we should not easily trust unverified information online.
办公室里的谣言总是这样传播，三人成虎，大家就信以为真了。(Bàngōngshì lǐ de yáoyán zǒng shì zhèyàng chuánbò, sān rén chéng hǔ, dàjiā jiù xìn yǐ wéi zhēn le.) — Rumors in the office always spread this way — three people make a tiger, and everyone comes to believe it.
社交媒体加剧了三人成虎的效应，一条假消息可以在几小时内被转发数万次，形成虚假的共识。(Shèjiāo méitǐ jiājù le sān rén chéng hǔ de xiàoyìng, yī tiáo jiǎ xiāoxi kěyǐ zài jǐ xiǎoshí nèi bèi zhuǎnfā shù wàn cì, xíngchéng xūjiǎ de gòngshí.) — Social media intensifies the three-people-make-a-tiger effect: a single false story can be shared tens of thousands of times in hours, forming a false consensus.