a flaw, gap, or weakness in a system, logic, or law

a natural underground chamber or series of passages

(astronomy) black hole

a natural underground chamber or cavern, typically within a mountain or hillside

devoid of substance, meaning, or practical value; empty of content

the mouth or opening of a cave, tunnel, or hole

to see clearly

An underground structure designed to protect people from bombs and aerial attacks.

a cave formed by the dissolution of soluble rocks, typically limestone

Dongting Lake in northeast Hunan province

to clearly understand

the nuptial chamber or room prepared for a newlywed couple's first night

a kind of cave dwelling in the Loess Plateau in northwest China

a digital space or social media account where people can post secrets or vent anonymously

a legendary or mythological residence of immortals or deities

a cave or natural cavern, often specifically referring to one formed in limestone

a tunnel-like passage or archway through a city gate, wall, or gatehouse

to pierce through something physically

cave; cavern

tunnel; cave; burrow; dugout

a cave

a bottomless pit; (figuratively) an insatiable drain on resources

full of flaws (of an argument, theory, etc.)

an abode of immortals in Taoist mythology; a fairyland or paradise

a small hole or cavity in an object

to be wide open

the arched opening or space under a bridge.

Hongtong county in Linfen, Shanxi

bridal room and ornamented candles; refers to the wedding night or wedding festivities

a place or landscape of exceptional charm and beauty

disturbing the privacy of the bridal room (a Chinese custom where guests banter with and play pranks on the newlyweds)

To entice an enemy or a hidden person out of hiding into the open, typically to expose or capture them.

Taepodong, North Korean rocket series

a deep and clear understanding of a complex situation or subject

a hole, pit, or pothole in a surface such as the ground or a road

Hongtong county in Linfen, Shanxi

Lü Dongbin (796-), Tang Dynasty scholar, one of the [[八仙|八仙|Ba1 xian1]]

a cave, hole, or pit in the ground or a mountain

physically empty and containing nothing; vacant

the Library Cave, a sealed cave (Cave 17) in the Mogao Caves where thousands of manuscripts were discovered in 1900

to see everything clearly

to see or understand a situation with absolute clarity, as if looking at a blazing fire; to possess deep insight

completely empty or hollow in a physical space