Meaning of CLUMP in English
I. clump 1 /klʌmp/ BrE AmE noun
[ Date: 1200-1300 ; Origin: Probably from Low German klump ]
1 . [countable] a group of trees, bushes, or other plants growing very close together
a thick clump of grass
in a clump
The roses were planted in clumps across the park.
2 . [countable + of] a small mass of something such as earth or mud
3 . [uncountable] the sound of someone walking with heavy steps:
I heard the clump of Ralph’s boots going up the stairs.
II. clump 2 BrE AmE verb
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.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012