"crumbling" in the verb sense
1. crumble, crumple, tumble, break down, collapse
fall apart
"the building crumbled after the explosion"
"Negotiations broke down"
2. crumble, fall apart
break or fall apart into fragments
"The cookies crumbled"
"The Sphinx is crumbling"
3. decay, crumble, dilapidate
fall into decay or ruin
"The unoccupied house started to decay"
Source: WordNet® (An amazing lexical database of English)
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