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wavefront

n.
1.(physics) an imaginary surface joining all points in space that are reached at the same instant by a wave propagating through a medium

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    Idiom of the Day

    cut across
    to cross or go through something instead of going around it
    We decided to cut across the field because we were in a hurry to get to school.



    1.
    The teacher ________ him do all the work again

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