Lumber  —n. 1 disused and cumbersome articles. 2 partly prepared timber. —v. 1 (usu. Foll. By with) leave (a person etc.) With something unwanted or unpleasant. 2 (usu. Foll. By up) obstruct, fill inconveniently. 3 cut and prepare forest timber. 4 move in a slow clumsy way. [origin uncertain]