1. wood that has been prepared for use in building or carpentry
Usage: primarily American English

1. to move in a slow, heavy, awkward way
2. to cut down trees and prepare the wood for commercial use

Examples

• The construction crew ordered lumber for the new house frame.
• We bought pine lumber at the hardware store.
• The old bear lumbered through the forest.
• The truck lumbered up the steep hill.
• They lumber in the Pacific Northwest forests.
• The elephant lumbered toward the watering hole.
• Quality lumber is essential for good construction.