riddle
noun
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a coarse sieve (as for gravel)
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a difficult problemenigmaconundrumbrain-teaser
verb
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set a difficult problem or riddle“riddle me a riddle”
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explain a riddle
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speak in riddles
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spread or diffuse throughdiffuse
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pierce with many holes“The bullets riddled the body of the car.”
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separate with a riddle, as grain from chaffscreen