What does "lump" mean?

Additional senses

1. 2.(Firearms) A projection beneath the breech end of a gun barrel. In the lump, In a lump, the whole together; in gross. They may buy them in the lump. Addison. -- Lump coal, coal in large lumps; -- the largest size brought from the mine. -- Lump sum, a gross sum without a specification of items; as, to award a lump sum in satisfaction of all claims and damages.
2. 3.To throw into a mass; to unite in a body or sum without distinction of particulars. The expenses ought to be lumped together. Ayliffe.
3. 4.To take in the gross; to speak of collectively. Not forgetting all others, . . . whom for brevity, but out of no resentment you, I lump all together. Sterne.
4. 5.To get along with as one can, although displeased; as, if he does n't like it, he can lump it. [Law]