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rarefaction

n.
1.a decrease in the density of something

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Word of the Day

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    Idiom of the Day

    under oath
    having taken a formal oath (solemn promise)
    The man was under oath when he spoke before the judge.



    1.
    Choose an idiom to replace the expression in the brackets:
    The man's idea is a little crazy and definitely (very unusual).

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