(lum′bər) noun
1. U.S. & Can. Timber sawed into board, planks, etc.
2. Disused articles laid aside.
3. Hence, rubbish, adjective Made of, pertaining to, or dealing in, lumber,
—v.t.
1. U.S. & Can. To cut down (timber); also, to cut down the timber of (an area).
2. To fill or obstruct with useless articles.
3. To heap in disorder.
—v.i.
4. U.S. & Can. To cut down or saw timber for marketing. [Var. of Lombard in obs. sense of “money-lender, pawnshop”; hence, stored articles]
—lum′ber·er noun

(lum′bər) v.i.
1. To move or proceed in a heavy or awkward manner.
2. To move with a rumbling noise.
—noun A rumbling noise. [Origin uncertain. Cf. Sw. lomra resound, loma walk heavily.]