One loach muddies the whole pond.

Sources and attribution

Unattributed Traditional proverb; individual author and earliest use unknown.

Source: National Institute of Korean Language — Korean Basic Dictionary , Korean Basic Dictionary, proverb: 미꾸라지 한 마리가 온 웅덩이를 흐려 놓는다

Origin: Korean proverb; individual author and earliest origin unknown

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Traditional Korean saying. English rendering and explanation by Quotations; not copied from the dictionary’s definitions. The reference documents usage, not first authorship.

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