1
- a small group of trees or plants growing closely together树丛, 植物丛：
a clump of ferns.
一丛蕨类植物。
1.1
- a small, compact group of people（人）群：
they sat on the wall in clumps of two and three.
他们三三两两坐在墙上。
1.2
- a compacted mass or lump of something（密实的）团; 块：
clumps of earth.
几块泥土。
1.3
- Physiology an agglutinated mass of blood cells or bacteria, especially as an indicator of the presence of an antibody to them【生理】（尤指标明抗体存在的）血细胞团; 细菌凝块。
2
- a thick extra sole on a boot or shoe（靴、鞋的）厚鞋底。
词源
Middle English (denoting a heap or lump)： partly imitative, reinforced by Middle Low German klumpe and Middle Dutch klompe; related to CLUB2.