lumber: [14] Swedish has a dialectal verb loma ‘move heavily’, which is the only clue we have to the antecedents of the otherwise mysterious English verb lumber. The noun, too, which first appears in the 16th century, is difficult to account for. In the absence of any other convincing candidates, it is presumed to have been derived from the verb (its earliest recorded sense is ‘useless or inconvenient articles’, plausibly close to the verb; ‘cut timber’ did not emerge until the 17th century, in North America). [lumber etymology, lumber origin, 英语词源]