clumping

verb

1. (form-of, gerund, participle, present)present participle and gerund of clump

noun

1. A clump or cluster.

   “BMP-2 and BMP-4 also induce the expression of the neurotrophin receptor, TrkC, in cultured crest-derived cells and induce the cells to coalesce into ganglion-like clumpings.”

2. The sound of walking with heavy footfalls.

   “Heavy backstair clumpings announce huge Ab, my negro paddler.”