Three men make a tiger

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"Three men make a tiger" (Chinese: 三人成虎; pinyin: sān rén chéng hǔ) is a Chinese proverb or chengyu (four-character idiom). "Three men make a tiger" refers to an individual's tendency to accept absurd information as long as it is repeated by enough people. It refers to the idea that if an unfounded premise or urban legend is mentioned and repeated by many individuals, the premise will be erroneously accepted as the truth. This concept is related to communal reinforcement or the fallacy of argumentum ad populum and argumentum ad nauseam.