MISE EN ABYME.
Meaning “to put in the abyss.”
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ABYSS.
Compound of a- “without” + byssos “bottom.” From the Latin abyssus, meaning “depths of the earth or sea; primordial chaos;” early 14c. as abime “a bottomless pit” and from the Greek abyssos (limne) “bottomless (pool),” hence, generally, “enormous, unfathomable.”