발 없는 말이 천리 길 간다
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Literal Meaning
Even words without feet travel thousand miles.
Also, can be translated as: Words without feet can go a thousand "ri." ("Ri" is an old form of measurement that equals approximately 0.4 kilometers.)
Usage
Same as above. Rumors spread quickly, so be careful of the things you say.
Korean Equivalent
말은 잠깐 사이에 먼 데까지 퍼진다.
English Equivalent
Bad news travels fast.