Meaning : Fall apart.
Example :
The building crumbled after the explosion.
Negotiations broke down.
Synonyms : break down, collapse, crumple, tumble
Meaning : Break or fall apart into fragments.
Example :
The cookies crumbled.
The Sphinx is crumbling.
Synonyms : fall apart
Meaning : Fall into decay or ruin.
Example :
The unoccupied house started to decay.
Synonyms : decay, dilapidate