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crumble

 
 
/ˈkrʌmbl/ verb

Definition

BREAK [I, T] to break into small pieces, or to make something break into small pieces: Buildings crumbled as the earthquake struck.
FAIL [I] If a relationship, system, or feeling crumbles, it fails or ends: His first marriage crumbled after only a year.
(Definition of crumble verb from the Cambridge Learner's Dictionary © Cambridge University Press)

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