hù​shū​bù​dù

constant activity prevents decay

  1. door
    (bound form) a single-leaf door; an entrance or opening to a house
  2. pivot
    (bound form) the hinge or axis of a door; a mechanical pivot
  3. adverb
    not
    Negative adverb used before verbs, adjectives, and other adverbs to indicate negation; also used as a bound-form prefix to form terms with opposite meanings
  4. to corrode
    (bound form) to eat into; to corrode; to be moth-eaten or worm-eaten