Meaning of “lump” - Learner’s Dictionary

lump

noun [ C ] uk us /lʌmp/
PIECE

a piece of a solid substance with no particular shape:

a lump of coal
You don't want lumps in the sauce.
ILLNESS

a hard piece of tissue under the skin caused by injury or illness:

She found a lump in her breast.

(Definition of “lump” from the Cambridge Learner’s Dictionary © Cambridge University Press)