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reaction propulsion

n.
1.propulsion that results from the ejection at high velocity of a mass of gas to which the vehicle reacts with an equal and opposite momentum

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    Idiom of the Day

    set the stage for (something)
    to prepare for something
    The win by our team set the stage for the final championship game next month.



    1.
    Choose an idiom to replace the expression in the brackets:
    It is (his decision) whether or not he goes to Europe.

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