used in 洪洞[Hong2 tong2] (the name of a place in Shanxi)

(astronomy) black hole

cavern; cave

leak; hole; gap; loophole

cavity; empty; vacuous

air raid shelter; bomb shelter; (fig.) place that protects bad people; hideout

to dig a hole

tunnel; cave; burrow; dugout

to bore; to burrow; to crawl through a tunnel

hole; pit; pothole

ear piercing hole; earring hole

hole in ice; crevasse

cavity; pit

variant of 涵洞[han2 dong4]

small hole in an object

to punch a hole; to drill a hole; to dig a hole; to burrow

tree hollow; (slang) anonymous platform for sharing secrets; (slang) confidant

see 洪洞縣|洪洞县[Hong2 tong2 Xian4]

culvert

(geology) solutional cave (typically, a limestone cave)

dog door

electron hole (physics)

white hole (cosmology)

cave; cavern

a hole

pierce

yaodong (a kind of cave dwelling in the Loess Plateau in northwest China); CL:孔[kong3]

Rodong or Nodong, series of North Korean medium-range missiles

(physics) wormhole

passageway; archway

tunnel

wind tunnel

hole due to dental caries

cave; natural cavern (in limestone)

Renzidong palaeolithic archaeological site at Fanchang 繁昌[Fan2 chang1], Anhui

Buddhist grottos

Taepodong, North Korean rocket series

grotto

to blow people's minds with highly imaginative, bizarre ideas

Zhang Zhidong (1837-1909), prominent politician in late Qing

bottomless pit

cave with a waterfall at its mouth

empty; deserted

mouse hole

the Library Cave, a sealed cave (Cave 17) in the Mogao Caves 莫高窟[Mo4 gao1 ku1], where thousands of manuscripts were discovered in 1900

pitch-dark

hole in one (golf)

(golf) hole in one

lit. to pull a snake from its hole; to expose a malefactor (idiom)