sinkhole
N บ่อน้ำ bor-nam
sink hole |ˈsiNGkˌhōl ˈsɪŋkˌhoʊl | ▶noun a cavity in the ground, esp. in limestone bedrock, caused by water erosion and providing a route for surface water to disappear underground.
sink |hole |ˈsɪŋkhəʊl | ▶noun a cavity in the ground, especially in a limestone formation, caused by water erosion and providing a route for surface water to disappear underground.
s í nk h ò le 名詞 C 1 (流しの )穴 ; 下水 [汚水, ごみ ]だめ .2 〘地 〙ドリーネ 〘すり鉢状くぼ地 〙.3 悪の巣 .