lumber

To make a heavy rumbling noise; rumble: chiefly in the present participle.

To move heavily or cumbrously: chiefly in the present participle.

To stumble. Also lumper.

Things, more or less bulky and cumbersome, thrown aside (or which may be thrown aside) as of no present use or value.

Timber sawed or split for use, as beams, joists, boards, planks, staves, hoops, and the like.