凹

オウ

くぼ.む、へこ.む、ぼこ

凹, 凵

凵

concave, hollow, sunken

凸凹(でこぼこ): unevenness; roughness; ruggedness
凹む(へこむ): (1) to be dented; to be indented; to yield to; to give; to sink; to collapse; to cave in (2) to be overwhelmed; to feel down; to be forced to yield; to be daunted; to be snubbed