say it: KRUHM-buhl
crumble is a verb meaning "fall apart". It carries 3 recorded senses.
fall apart
“the building crumbled after the explosion”
“Negotiations broke down”
break or fall apart into fragments
“The cookies crumbled”
“The Sphinx is crumbling”
fall into decay or ruin
“The unoccupied house started to decay”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for crumble come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.