an implement used in baseball by the batter
"The batter swung his lumber to hit the ball but missed completely."
Old furniture or other items that take up room, or are stored away.
"The attic was filled with dusty lumber from his grandmother's old house."
In plain English: Lumber is wood that has been cut and processed but not yet made into finished furniture or structures.
"The floor was covered in rough lumber waiting to be milled into planks."
Usage: As a noun, lumber refers specifically to old furniture or bulky household items kept in storage rather than general wood planks. When used as a verb, it describes moving with heavy, clumsy steps instead of walking lightly or quickly.
To move clumsily and heavily; to move slowly.
"The old man lumbered across the yard, his joints stiff from years of arthritis."
In plain English: To lumber means to move very slowly and heavily, usually because you are tired or carrying something big.
"The old man lumbered slowly to his feet after sitting for hours."
The exact origin is unknown, but the word likely comes from a verb meaning "to move awkwardly," possibly related to the root of lame. It entered English as a noun referring to heavy or discarded objects like old furniture, perhaps influenced by associations with Lombard money-lenders.