oubliette
[oo-blee-et]
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noun
1.
a secret dungeon with an opening only in the ceiling, as in certain old castles.
Origin of oubliette Expand
< French, Middle French, equivalent to oubli(er) to forget, Old French oblider < Vulgar Latin;re, derivative of Latin;tus (past participle of; to forget; see oblivion) + Middle French -ette -ette
I take it they just threw you in and then, if you survived the drop, they’d plug the hole and leave you in the dark.