the.com/lumber
Trees, sentenced to usefulness and stacked in neat, splintery rectangles.
means Wood sawn into planks and boards for building, or the act of moving heavily and clumsily.
from From medieval English meaning to move awkwardly, then disused junk cluttering a pawnshop (a lumber-room), then finally the stored timber itself — clutter that got promoted.
Double lifeMeans both stored timber and walking like furniture.
Pawnshop rootsA lumber-room once held pawned, abandoned goods.
Burdened tooTo be lumbered means stuck with something unwanted.