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catalyst

n.
1.(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
2.something that causes an important event to happen

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    Idiom of the Day

    save face
    to preserve one`s good reputation or dignity when something has happened to hurt it
    Our boss is responsible for many problems in our company. He wants to quit before he is fired so that he can save face.



    1.
    The little pianist took a ________ after he finished playing his sonatina.

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