clump
noun
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a heavy dull sound (as made by impact of heavy objects)thump
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a grouping of a number of similar thingsbunchclusterclustering
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a compact massball
verb
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to gather or cause to gather into a clusterbundle
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to walk clumsilyclomp
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to come together as in a cluster or flockflockclusterconstellate
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to make or move along with a sound as of a horse's hooves striking the groundplunk