expression, noun
horse's back
Literal meaning: the back of a horse. Used in contexts of riding or describing the animal.
彼は馬の背に乗って草原を走った。
He rode on the horse's back across the grassland.
expression, noun
mountain ridge; arête; road along a ridge
Figurative use: a narrow mountain ridge or a road running along such a ridge, likened to the shape of a horse's back. Often used in geographical descriptions or hiking contexts.
登山道は馬の背のような尾根を進む。
The trail follows a ridge like a horse's back.
馬の背を歩くときは足元に注意してください。
Please watch your step when walking along the narrow ridge.