to be dented ②to be beaten ③to be disheartened ④to suffer a loss

to dent

to dent

concavity

unevenness ②imbalance

concave

concave lens

cavernous eyes

concave glasses

concavity

concavity ②concave

concave mirror

intaglio (printing)

intaglio printing

embossed paper

costal fovea

concave polygon

concavity

concave angle

plano-concave lens

unevenness ②inequality

odd couple

rice field in a low place

hollow

to be low (as a hollow)

to hollow out

hollow

sunken (deep-set) eyes

when the right conditions are fulfilled, things will turn out well on their own ②someone in bad circumstances will continue to accumulate difficulties