The lips and cheeks bristled with that kind of hard, clumpy beard which old priests have who have always shaved themselves.
Their clumpy heads blend ill with the spiry tops of the juniors.
This causes it to be clumpy — that is, not straight like most wild roots.
1580s, "lump; cluster of trees," from Middle English clompe "a lump" (c.1300), from Dutch klomp "lump, mass," or Middle Low German klumpe "clog, wooden shoe." Old English had clympre "lump, mass of metal."
"to heap or gather in clumps" (transitive), 1824, from clump (n.). Related: Clumped; clumping. Intransitive sense "to form a clump or clumps" is recorded from 1896.
"walk heavily," 1660s, imitative. Related: Clumped; clumping.