[noun] [C usually plural] - a series of underground passages and rooms where bodies were buried in the pastThey went down into catacombs beneath the church.(figurative) The original tape languished in the film studio's catacombs (= a place where few people ever go) for many years.
CATACOMB
Meaning of CATACOMB in English
Cambridge English vocab. Кембриджский английский словарь. 2012