戶樞不蠹

hùshūbúdù

a doorhinge never becomes wormeaten—constant activity staves off decay

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hu4 shu1 bu4 du4

lit. a door hinge never becomes worm-eaten, constant activity prevents decay (idiom)

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戶樞不蠹|户枢不蠹 [hù shū bù dù] ► lit. a door hinge never becomes worm-eaten ► constant activity prevents decay (idiom)