1. (n.) A small mass of matter of irregular shape; an irregular or shapeless mass; as, a lump of coal; a lump of iron ore.

2. (n.) A mass or aggregation of things.

3. (n.) A projection beneath the breech end of a gun barrel.

4. (v. i.) To throw into a mass; to unite in a body or sum without distinction of particulars.

5. (v. i.) To take in the gross; to speak of collectively.

6. (v. i.) To get along with as one can, although displeased; as, if he doesn't like it, he can lump it.