Longman Dictionary of Contemporary English homepage

clump

2 verb
     
clump2
1 [intransitive always + adverb/preposition] to walk with slow noisy steps
clump up/down/along etc
The kids clumped up the stairs in their boots.
2 also clump together [intransitive and transitive] if separate objects clump together, or are clumped together, they form a group or solid mass:
Hair and soap had clumped together in the drain.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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