凹陷

āoxiàn
to cave in; hollow; sunken; depressed

CEDICT

to cave in; to be sunken

Wiktionary

向中間陷進去。

重編國語辭典

向中間陷進去

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