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carbon black

n.
1.a black colloidal substance consisting wholly or principally of amorphous carbon and used to make pigments and ink

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    Idiom of the Day

    driving force behind (someone or something)
    the motivating force behind someone or something
    The potato farmers were the driving force behind the efforts to get people to eat more potatoes.



    1.
    Choose an idiom to replace the expression in the brackets:
    The two boys (began to fight) in the school grounds.

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