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plutonium pit

n.
1.a steel or beryllium sphere containing plutonium 239 that triggers nuclear fission when compressed by explosives

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    Idiom of the Day

    off the cuff
    not prepared in advance (used when you are talking)
    My father made a few remarks off the cuff when he was accepting the award from his company.



    1.
    Choose an idiom to replace the expression in the brackets:
    The couple were (only joking with me) about the lost dog.

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