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

to flow / to disseminate / to circulate or spread / to move or drift / to degenerate / to banish or send into exile / stream of water or sth resembling one / class, rate or grade

running water / (business) turnover

surname Shui

water / river / liquid / beverage / additional charges or income / (of clothes) classifier for number of washes

no; not so / (bound form) not; un-

flowing water does not rot

decay / rotten

a household / door / family

hinge / pivot

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

insect that eats into books, clothing etc / moth-eaten / worm-eaten