Lump n.
 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.”
 2. A mass or aggregation of things.
 3. 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) 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.