slope

(earth) + (anti) Same-ON
★★★☆☆
7 strokes

Onyomi

HAN

Mnemonic

HAN solo, accustomed to the zero-gravity of space, is against climbing the steep slopes of the earth!

Kunyomi

さか a slope of a hill (BOOBOO: not the hill itself. Hills are the similar-sounding おか!)
★★★☆☆

Jukugo

下り坂(くだりざか)

go downhill ★★★☆☆
(below) + (slope) = 下り坂 (go downhill )

A noun meaning, "the act of going downhill." Unhelpfully, this is not used as a verb. What the hell, man?

上り坂(のぼりざか)

go uphill ★★★☆☆
(above) + (slope) = 上り坂 (go uphill )

"the act of going uphill." Same deal.

Lookalikes

Meaning Hint Radical
plank WOOD
provisional PERSON
slope EARTH

The board is made of WOOD
The PERSON is provisionally good (before xmas).

The EARTH has slopes called hills.