Present participle of crum; the ongoing action of crushing, breaking, or reducing something into crumbs.
From the verb 'crum' with the present participle suffix '-ing,' which is the most common way English marks verbs in continuous or progressive tenses.
The '-ing' form is so fundamental to English that we barely notice it, but it's the way we turn any action verb into a noun or continuous tense—'run' becomes 'running,' 'crum' becomes 'crumming.'
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