凹 - concave, hollow, sunken

to be dented; to be indented; to yield; to give; to sink; to collapse; to cave in

unevenness; bumpiness; roughness; ruggedness

unevenness; roughness; ruggedness; bumpiness

hollow; cavity; dent; depression

to dent; to indent; to depress; to humiliate

concave mirror

concave polygon; non-convex polygon

concave angle; (a) re-entrant

Africa Scream (film)

odd couple; incongruous couple

concave; hollow; sunken

to hollow out