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Meaning of 流水不腐,户枢不蠹

Lookup via: Pinyin | Radicals
流 liú 水 shuǐ 不 bù 腐 fǔ , , 户 hù 枢 shū 不 bù 蠹 dù (Trad.: 流水不腐,戶樞不蠹)
lit. flowing water does not rot, nor a door-hinge rust (idiom); fig. constant activity prevents decay