Sentence:  Thus the red damask curtains which now shut out the fog-laden, drizzling atmosphere of the Marylebone Road, had cost a mere song, and yet they might have been warranted to <WSD>last</WSD> another thirty years. A great bargain also had been the excellent Axminster carpet which covered the floor;nb.... 
Meaning of the word marked with <WSD> tags:  To endure, continue over time.