Britannica Dictionary definition of UPKEEP
[noncount]
:
the process of keeping something in good condition
:
the care or maintenance of buildings, equipment, etc.
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Who is responsible for the upkeep of these buildings?
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Once your car gets that old, the cost of upkeep can get very expensive.
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The yard requires very little upkeep.
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We sold our horse because we could no longer afford its upkeep.