流水不腐，户枢不蠹
Traditional form:
流水不腐，戶樞不蠹
Pinyin (reading):
liúshuǐbùfǔ,hùshūbùdù
Definitions:
- lit. flowing water does not rot, nor a door-hinge rust (idiom)
- fig. constant activity prevents decay
Characters:
- 流 - to flow, to drift, to circulate; class
- 水 - water, liquid, lotion, juice
- 不 - no, not, un-; negative prefix
- 腐 - to spoil, to rot, to decay; rotten
- 户 - door; family
- 枢 - door hinge; pivot; center of power
- 不 - no, not, un-; negative prefix
- 蠹 - moth, bookworm; moth-eaten, worm-eaten
Traditional characters: