KanjiJLPT N2
Wall

wall, lining (stomach), fence

Mnemonic

The bazaar kept getting looted at night, so every merchant grabbed shovels and packed earth into enormous sun-dried bricks. Row by row they raised a mighty wall around the entire marketplace. Thieves now slam face-first into solid dirt—no way through.
Additional thoughts
Picture a bustling open-air market encircled by a towering earthen wall, merchants proudly patting the packed dirt surface. Earth is literally the building material of the bazaar's wall.
Quick recall
The bazaar packs earth into bricks to raise a mighty wall against thieves.

Details

The keyword for 壁 is wall. This kanji refers to a solid, vertical structure that encloses or divides a space, such as the walls of a room or building. It can also be used figuratively to describe an obstacle or barrier that is difficult to overcome, much like hitting a wall in one's progress. The character conveys a sense of something firm, immovable, and standing upright as a partition or boundary.
On'yomi
へき
Kun'yomi
かべ