concave, hollow, sunken
凹 centers on a shape that curves inward: something concave, hollow, or sunken. The idea applies to physical depressions and to things that are dented or caved in.
凹 is a pictograph of a concave depression, with the modern form preserving a hollowed-out shape.
The shape of 凹 looks like a container with a sunken middle. Picture pressing your thumb into soft clay and leaving a hollow dent: that is concave.
For オウ, imagine a hollow bowl that makes a deep 'oh' sound when you tap it: 'oh' -> オウ, and the bowl is concave.
to be dented; to be indented; to yield; to give; to sink; to collapse; to cave in
unevenness; roughness; ruggedness; bumpiness
unevenness; bumpiness; roughness; ruggedness
hollow; cavity; dent; depression
concave; hollow; sunken
concavity
odd couple; incongruous couple
Africa Scream (film)
embossed paper
when the right conditions are fulfilled, things will turn out well on their own; a sunken place will collect water
to lose heart; to be discouraged; to be dejected; to be exhausted; to be tired out
to dent; to indent; to depress; to humiliate
to dent; to indent; to depress; to humiliate
to hollow out
concave lens
concave polygon; non-convex polygon
concavity
concavity; hollow; depression
intaglio plate
intaglio printing