KanjiJLPT N1
Enclosure

enclosure, quarters, fortification, red-light district

Mnemonic

A village that receives constant threats decides to build a grand enclosure — towering outer walls encircling every street and home. Now anyone the village receives must first pass through the enclosure's fortified gates, proving they come in peace.
Additional thoughts
Picture a walled medieval village: the act of receiving visitors only happens at the gate of the enclosure. Receive + Village = defensive perimeter around the settlement.
Quick recall
A village that receives threats builds an enclosure of mighty walls.

Details

The keyword for 郭 is enclosure. This kanji refers to an outer wall or fortification that surrounds and encloses a castle, city, or settlement, serving as a defensive boundary. It conveys the idea of a defined perimeter that marks the limits of a protected area. By extension, it can also refer to a district or quarter within a city, particularly one that is distinctly bounded or demarcated.
On'yomi
かく
Kun'yomi
くるわ