上り (nobori) means “climb” | MotiTan Japanese Dictionary

More examples

この道は駅まで上りが続きます。ko no michi wa eki ma de nobo ri ga tsuzu ki ma su

The uphill stretch continues all the way to the station.

Treats going upward as a climb that can refer either to the action or to the uphill section itself.

上り坂noborizaka: A sloping section of a road or path that rises.
登坂tohan: The act of climbing a slope, especially during travel or a race.

坂や階段などを低い方から高い方へ進むこと。また、その道や区間。saka ya kai dan na do o hiku i hō ka ra taka i hō e susu mu ko to ma ta so no michi ya ku kan

上る (noboru, "to go up") changes to 上り (nobori) as its continuative stem, which also functions as a noun for an ascent.

In Japanese road and race talk, 上り (nobori) often names the uphill part of a route rather than only the act of moving upward.