It is known to everyone; as everyone knows.
大家普遍知道的。
《玉娇梨》第二十回城中宣杂难住，莫苦就在众所周知石村卜一居，与白公为邻。”
As is known to all, honesty is the best policy.
Learn the next connected idiom: 众所周知 (zhòng suǒ zhōu zhī) → 知法犯法 (zhī fǎ fàn fǎ)
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