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thermionic vacuum tube

n.
1.electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

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    Idiom of the Day

    lose ground
    to go backward, to become weaker, to not improve
    The government has been losing ground in the fight against inflation.



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    Choose an idiom to replace the expression in the brackets:
    The house (was destroyed by fire) during the electrical storm.

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    Stage bows were originally devised as a way for actors to thank the audience. The audience would or would not acknowledge each of the actors in turn, depending on how much they enjoyed the performance.      .. More >>
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