IPA: /ˈʌpˌkiːp/
KK: /ˈʌpˌkip/
The process of keeping something in good condition through regular maintenance and repairs.
The upkeep of the park requires a lot of time and money.
Upkeep is formed from "up" (meaning higher or in a higher position) and "keep" (from Old English "cepan", meaning to hold or maintain). The word "upkeep" refers to the act of maintaining something in good condition, often implying that it is kept in a higher standard or state.
Think of 'keeping' something in a 'higher' condition — that's what upkeep means.