IPA: /ˈblɒkˌhaʊs/
KK: /ˈblɒkˌhaʊs/
A strong building made of wood or concrete, used for military defense or to protect people and equipment.
The soldiers took shelter in the blockhouse during the attack.
Blockhouse → It is formed from "block" (from Middle Dutch *blok*, meaning a solid piece of wood or a large piece) and "house" (from Old English *hus*, meaning dwelling or shelter). A blockhouse refers to a sturdy structure made of solid materials, often used for defense or shelter.
Think of a solid 'piece' ('block') of material that forms a 'shelter' ('house') — that's why a blockhouse is a strong, protective building.