きゅう勾配 こうばい
kyūkōbai

Noun

1. steep slope

山越 やまごえの みち せまく、しかも きゅう勾配 こうばいだった。
yamagoeno michiwa semaku shikamo kyūkōbaidatta.
The road across the mountain was narrow, and what's more, it was a steep slope.