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: a basement or an underground story located below the main basement of a building
… describing in loving detail the enormous, complex structure from the bottom up, its subbasement … is full of gleaming pipes, turbines and boilers. —Burton Bernstein
circa 1776, in the meaning defined above
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What made you want to look up subbasement? Please tell us where you read or heard it (including the quote, if possible).
to deposit or conceal in a hiding place
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