I. up ‧ hill 1 /ˌʌpˈhɪl◂/ BrE AmE adjective
1 . towards the top of a hill OPP downhill :
an uphill climb
2 . an uphill struggle/battle/task etc something that is very difficult to do and needs a lot of effort and determination
II. uphill 2 BrE AmE adverb
towards the top of a hill OPP downhill :
The road twists uphill.