1
: a piece or mass of indefinite size and shape
a lump of coal
a lump of clay
2
3
: protuberance
especially
: an abnormal swelling
came to with nothing more than a lump on his head
4
: a person who is heavy and awkward
a lump of a man
also
: one who is stupid or dull
lumped; lumping; lumps
1
: to group indiscriminately
2
: to make into lumps
also
: to make lumps on or in
3
: to move noisily and clumsily
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Merriam-Webster unabridged
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