隙 means “gap, crevice, opening”

すき · suki

Also: fissure, discord, opportunity

Kun'yomi (Japanese reading)
すき, すく, すかす, ひま
On'yomi (Chinese reading)
ゲキ, キャク, ケキ

JLPT N1 · Taught in secondary school · 13 strokes

The story

A sun (日) squeezed between two small (小) marks beside a hill wall (阝): light through a crack. 隙 is a gap or an opening: 隙間 is a crack, 隙間風 a draft, and a fighter waits for the opponent's 隙, an unguarded moment.

Used in 隙間 (sukima, gap/crack), 隙間時間 (sukima jikan, spare moments), and 間隙 (kangeki, gap/interval)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.