くぼみ

(1)a concave shape with an open top

(2)上部が開いた凹形

(3)a sizeable hole (usually in the ground); "they dug a pit to bury the body"

(4)（ふつう地面に掘られた）かなり大きい穴

(5)a concavity in a surface (especially an anatomical depression)

(6)表面のくぼみ（特に解剖学上のくぼみ）