noun
a fictional device described in George Orwell's novel 1984, used to erase or alter historical records and memories
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The government official ordered all documents related to the scandal to be thrown into the memory-hole.
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I accidentally threw my keys into the memory-hole and now I can't find them anywhere.
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I heard that company likes to memory-hole any negative reviews about their products.
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Sometimes I feel like my brain has a memory-hole for all the embarrassing moments I'd rather forget.