隙
ゲキ, キャク, ケキ, すき, す.く, す.かす, ひま

crevice, fissure, discord, opportunity, leisure

JLPT0 G7 S13 F5000

The right-hand element# originally combined 小 small (doubled) + 白 white (→ light) → faint light emanating small fissures. 隙 adds 阜 piled earth → *fissure/crack/crevice* in a mound or wall → *discord* (← fissure between individuals). Also, *spare time* (← open space in one's schedule).

[Full Kanji Etymology List]