KanjiJLPT N2
Gap

crevice, fissure, discord, opportunity, leisure

Mnemonic

A Gap splits the village wall. A little beam of sunlight pours through the crack, and a little spy seizes the unguarded moment to slip inside.
Additional thoughts
Picture a crumbling village wall with sunlight streaming through a narrow crack. Two 'little' elements frame the sun—like two small edges of the gap itself. Light betrays the weakness, and someone exploits it.
Quick recall
A Gap in the village wall lets a little beam of sun through—a little opening to exploit.

Details

The keyword for 隙 is gap. This kanji refers to a crack, crevice, or opening between two things, whether physical or metaphorical. It can describe a narrow space between objects, a lull or pause in time, or an emotional rift between people. It also carries the nuance of an unguarded moment or vulnerability—an opening that someone might exploit.
On'yomi
げき、きゃく、けき
Kun'yomi
すき、す.く、す.かす、ひま

Used in vocab