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lump 1

1. An irregularly shaped mass or piece.
2. A small cube of sugar.
3. Medicine A swelling or small palpable mass.
4. A collection or totality; an aggregate.
5. A person regarded as ungainly or dull-witted.
6. lumps Informal
a. Severe punishment or treatment, as a beating or an unsparing criticism: take one's lumps.
b. One's just deserts; comeuppance: get one's lumps.
1. Formed into lumps: lump sugar.
2. Not broken or divided into parts: a lump payment.
v. lumped, lump·ing, lumps
1. To put together in a single group without discrimination.
2. To move with heavy clumsiness.
3. To make into lumps.
1. To become lumpy.
2. To move heavily.
lump in (one's) throat
A feeling of constriction in the throat caused by emotion.

[Middle English lumpe, of Low German origin; akin to obsolete Dutch lompe.]

lump 2

tr.v. lumped, lump·ing, lumps Informal
To tolerate (what must be endured): like it or lump it.

[Perhaps from dialectal lump, to look sullen.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
A little later, in another department of the Wilmax Cannery, lumping as a fruit-distributor among the women, he essayed to carry two boxes of fruit at a time, and was promptly reproached by the other fruit-lumpers.
In the field of crude oil hydrogenation, the lumping kinetic models were widely used for designing the corresponding reactors and catalysts, simulating reactions, and optimizing operation conditions [24-28].
This appears to be due in large part to a high level of species aggregation or lumping. For example, web 1 includes single species representing all benthic organisms, all carnivorous fish, and all other fish.