noun
halfway up a mountain; mountainside
Refers to the middle part of a mountain slope, not the summit or the base. Used in both literal and figurative contexts.
山の中腹に小さな神社がある。
There is a small shrine halfway up the mountain.
霧が中腹を覆っていた。
Fog covered the mountainside.
Compound of 中 (middle) and 腹 (belly, here metaphorically the slope of a mountain). The reading ちゅうふく follows standard on'yomi.