concave, hollow, sunken · lõm

訓くぼ(む),へこ(む),ぼこ・音オウ

Sino-Vietnamese: ao

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A pictograph of a shape sunk in the middle, the opposite of 凸 (convex). Sino-Vietnamese ao, like a hollow pond.

オウ

くぼ(む),へこ(む),ぼこ

Sino-Vietnamese: ao

Stroke data: KanjiVG (CC BY-SA 3.0) — kanjivg.tagaini.net

凵

Open box (bottom)

2 strokes

車のドアが凹んでしまった。 (くるまのどあがへこんでしまった)

The car door got dented.

凸凶