Plural of crumbling; multiple instances or pieces of things that are breaking apart into fragments.
From 'crumbling' (present participle of 'crumble') plus plural '-s.' Used as a noun to describe the literal fragments or repeated instances of disintegration.
You can find 'crumblings' in geology when describing how rocks break down, in literature describing ruins, and in psychology describing how certainties fall apart—one word tracking different kinds of collapse.
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