1. sinkhole - Noun
2. sinkhole - Verb
a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof
Source: WordNetA karst fenster occurs when an underground stream emerges onto the surface between layers of rock, cascades some distance, and then disappears back down, often into a sinkhole. Source: Internet
A sinkhole located in the median of Interstate 81 southbound in Rockbridge County at mile marker 203.5 will be repaired on Wednesday beginning at 8 p.m. Source: Internet
A sinkhole opened on the A26 Tonbridge Road, outside the Taj Barming restaurant in 2018. Source: Internet
But the idea was being revisited at the close of the decade; Horizons had lost its corporate sponsorship and a large sinkhole had been detected underneath its massive show building. Source: Internet
Piping pseudokarst The 2010 sinkhole in Zona 2 In February 2007, a very large, deep circular hole with vertical walls opened in northeastern Guatemala City (coord39), killing five people. Source: Internet
A massive underwater sinkhole made famous by Jacques Cousteau. Source: Internet