凹陷

āoxiàn
to cave in; hollow; sunken; depressed

CEDICT

to cave in; to be sunken

Wiktionary

向中间陷进去。

重編國語辭典

向中间陷进去

維基詞典

Entry Composition

1 凹 āo concave; depressed; sunken; indented; female (connector etc)
2 陷 xiàn
  1. pitfall
  2. trap
  3. to get stuck
  4. to sink
  5. to cave in
  6. to frame (false charge)
  7. to capture (a city in battle)
  8. to fall (to the enemy)
  9. defect