凹む

1. godan verb, intransitive to be dented; to be indented; to yield; to give; to sink; to collapse; to cave in
2. to be beaten; to be overwhelmed; to yield; to give in; to give up
3. colloquial to be disheartened; to feel down; to feel depressed
4. to suffer a loss; to lose

くぼむ also 窪む

1. godan verb, intransitive to cave in; to become depressed; to sink