noun
lean-to; simple shelter
A rare term for a basic, temporary shelter with a single sloping roof, often built against a wall or tree.
山の中で差し掛け小屋を見つけた。
I found a lean-to in the mountains.
仮小屋 is a more general term for a temporary hut or shack, while 差し掛け小屋 specifically refers to a lean-to structure.
Compound of 差し掛け (sashikake, 'leaning against') + 小屋 (koya, 'hut'). The exact historical derivation is uncertain, but the term describes a shelter with a roof that leans against a support.