三人成虎 [－－－－]

Jyutping saam1 jan4 sing4 fu2
Pinyin sān rén chéng hǔ

Definitions (CC-CEDICT)
  1. three men talking makes a tiger (idiom); repeated rumor becomes a fact
Definitions (粵典–words.hk)
  1. 語句
    謠言多​人講​就​會​有人​信
    repeated rumor becomes a fact; literally: three men (talking) makes a tiger
Definitions (Wiktionary)
  1. proverb
    What you are told three times is true. If something is repeated by many individuals, it will be accepted as truth.