| 户 |
hù shū bù dù | lit. a door hinge never becomes worm-eaten / constant activity prevents decay (idiom) |
| 户 |
hù | a household / door / family |
| 枢 |
shū | (bound form) hinge; pivot (usu. fig.) |
| 不 |
bù | no; not so / (bound form) not; un- |
| 蠹 |
dù | insect that eats into books, clothing etc / moth-eaten / worm-eaten |