Translation guide
A physical barrier that shields or defends an area, person, or thing from harm, danger, or unwanted intrusion.
A wall built to protect a place or people from physical threats like attacks, floods, or wind.
Something that acts like a wall to protect against non-physical threats, such as emotional harm or criticism.
Literally 'wall of the heart', used for emotional barriers people put up.
Directly translating 'protective wall' as 保護壁 (ほごへき) is not common in Japanese. Use 防護壁 or 防壁 for physical barriers, and 心の壁 for emotional barriers.
その建物は防護壁で囲まれている。
The building is surrounded by a protective wall.
海岸沿いに防壁が築かれた。
A protective wall was built along the coast.
The retaining wall prevents landslides.
He builds a protective wall around his heart and doesn't let anyone get close.
Can be used metaphorically for a defensive barrier in arguments or social situations.
I put up a protective wall against his criticism.