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concave polygon

n.
1.a polygon such that there is a straight line that cuts it in four or more points

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    Idiom of the Day

    use some elbow grease
    to use some effort
    We used a lot of elbow grease to clean the oven.



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    The rescuers tried desperately to listen out for people trapped in the wreckage but sadly the cries of those trapped were ________ .

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