sinkhole


Main Entry: sink·hole
Pronunciation: \ˈsiŋk-ˌhōl\
Function: noun
Date: 15th century
1
: a hollow place or depression in which drainage collects
2
: a hollow in a limestone region that communicates with a cavern or passage
3
: sink 2
4
: something (as an unprofitable investment) that steadily drains money or resources <a financial sinkhole>