"a bunch of trees" "a cluster of admirers"
"a ball of mud caught him on the shoulder"
"The poets constellate in this town every summer"
"She bunched her fingers into a fist"
A baker gave me a clump o' bread.
Every clown with his clumping dirty shoes.
They clumped around in tweeds and brogues.
牛津高阶第八版
美国韦氏词典
Dictionary.com
Free Dictionary
维基百科 (自由的百科全书)