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From The Collaborative International Dictionary of English v.0.48:
Upkeep \Up"keep`\, n. 1. The act of keeping up, or maintaining; maintenance of persons, organizations, or objects such as machinery, by providing a location, repairs, and consumable items when necessary. "Horse artillery . . . expensive in the upkeep." --Scribner's Mag. [Webster 1913 Suppl. +PJC] Small outlays for repairs or upkeep of buildings. --A. R. Colquhoun. [Webster 1913 Suppl.] 2. the cost of providing upkeep. [PJC]