dark hole; dark pit
Literal meaning: a hole or pit that is dark. Can be used figuratively for a dark, unknown place or situation.
Deep in the cave, a dark hole gaped open.
Slang or derogatory term for a stupid person, likening them to a dark, empty hole. Rare and possibly archaic.
That guy is a real idiot.
road taken by a Chinese ajari monk fleeing Emperor Xuanzong's wrath
Historical abbreviation of 闇穴道 (あんけつどう), referring to a specific escape route used by a Buddhist monk in 8th-century China. Very rare, specialized term.
See also: 闇穴道
"Anketsu" is a historical term for the road taken by a monk who incurred Emperor Xuanzong's wrath.
Standard kanji spelling for this word.
Variant spelling using 闇 (darkness) instead of 暗 (dark).
Compound of 暗 (dark) and 穴 (hole). The historical sense is an abbreviation of 闇穴道. The slang sense likely derives from the literal meaning.