Something or someone that crums, or a device used for breaking things into crumbs or small pieces.
Agent noun formed from 'crum' plus the suffix '-er,' following the standard English pattern of adding '-er' to verbs to create nouns for tools, people, or things that perform the action.
Like 'baker' comes from 'bake' and 'runner' from 'run,' 'crummer' shows how English builds vocabulary by adding '-er'—it's one of our most productive word-building tools.
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