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English definition of “hourglass”

hourglass

noun [C] uk   /ˈaʊə.ɡlɑːs/ us    /ˈaʊr.ɡlæs/
a glass container filled with sand that takes one hour to move from an upper to a lower part through a narrow opening in the middle, used especially in the past to measure time
(Definition of hourglass from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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