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Question 126·Hard·Words in Context

The following text is adapted from a 1913 journal kept by mountaineer Helen Cartwright.

By the time we reached the final camp, the wind had scoured every loose particle from the ridge and our provisions were all but exhausted. We husbanded what little kerosene remained, filling the lamps only halfway and trusting moonlight to do the rest.

As used in the passage, what does the word “husbanded” most nearly mean?