From The Collaborative International Dictionary of English v.0.48:
Lump \Lump\ (l[u^]mp), n. [Cf. OD. lompe piece, mass. Cf.
Lunch.]
1. A small mass of matter of irregular shape; an irregular or
shapeless mass; as, a lump of coal; a lump of iron ore. "
A lump of cheese." --Piers Plowman. " This lump of clay."
--Shak.
[1913 Webster]
2. A mass or aggregation of things.
[1913 Webster]
3. (Firearms) A projection beneath the breech end of a gun
barrel.
[1913 Webster]
In a lump, the whole together; in gross.
[1913 Webster]
They may buy them in the lump. --Addison.
Lump coal, coal in large lumps; -- the largest size brought
from the mine.
Lump sum,
(a) a gross sum without a specification of items; as, to
award a lump sum in satisfaction of all claims and
damages.
(b) a single sum paid once in satisfaction of a claim, as
contrasted with the alternate choice of several
payments over a period of time; -- sometimes allowed,
e.g., as an alternative to periodical pension payments
for a lifetime.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Lump \Lump\, v. i. [imp. & p. p. Lumped; p. pr. & vb. n.
Lumping.]
1. To throw into a mass; to unite in a body or sum without
distinction of particulars.
[1913 Webster]
The expenses ought to be lumped together. --Ayliffe.
[1913 Webster]
2. To take in the gross; to speak of collectively.
[1913 Webster]
Not forgetting all others, . . . whom for brevity,
but out of no resentment to you, I lump all
together. --Sterne.
[1913 Webster]
3. To get along with as one can, although displeased; as, if
he doesn't like it, he can lump it. [Low]
[1913 Webster]