up ‧ keep /ˈʌpkiːp/ BrE AmE noun [uncountable]
1 . the process of keeping something in good condition SYN maintenance
upkeep of
Most of the money is spent on the upkeep of the building.
2 . the cost or process of looking after a child or animal and giving them the things they need:
Poorer people find it hard to pay for their pet’s upkeep.