: to decline from a sound or prosperous condition
: to decrease usually gradually in size, quantity, activity, or force
- The three voices … decayed and died out upon her ear.
- —Thomas Hardy
: to fall into ruin
- the city's decaying neighborhoods
: to decline in health, strength, or vigor
- Her mind is beginning to decay with age.
- believes that the moral fiber of our society is decaying
: to undergo decomposition
- … most isotopes of copper decay quickly, but two are stable: Cu-63 and Cu-65.
- —David E. Thomas
: to cause to decay : impair
- infirmity that decays the wise
- —William Shakespeare
: to destroy by decomposition