clumping
clump-ing
verb
Forming or causing something to form into a compact mass or group.
"The wet flour was clumping in the bowl."
noun
The process of forming or gathering into a compact mass or group.
"We observed the clumping of cells under the microscope."
Thesaurus
Synonyms: clip-clop, clopping, clippety-clop, clunking, clop