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optical fibre

n.
1.a very thin fiber made of glass that functions as a waveguide for light

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    Idiom of the Day

    walk up to (someone or something)
    to approach someone or something
    The man walked up to the policeman and asked him a question.



    1.
    Choose an idiom to replace the expression in the brackets:
    "(Don`t worry) about locking the door. I will do it later."

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