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circle of curvature

n.
1.the circle that touches a curve (on the concave side) and whose radius is the radius of curvature

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    Idiom of the Day

    bog down
    to slow down and make no progress, to become stuck (a bog is an area of land that is wet and muddy - like a swamp)
    I quickly became bogged down with all of the work that I had to do.



    1.
    Choose an idiom to replace the expression in the brackets:
    The man is very (good at fixing things) around the house.

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