Definition of speaking tube in English:

speaking tube

noun

  • A pipe for conveying a person's voice from one room or building to another.

    • ‘Over the speaking tube, and in a much more forceful tone, the pilot once again told me to do a loop.’
    • ‘She would have had to use a speaking tube and something like a gas mask while shouting very loudly.’
    • ‘He didn't do a great deal himself, apart from shouting down an ancient speaking tube to the unseen troglodytes who worked in the wine cellars far below.’
    • ‘His bed is still there, together with the speaking tubes that kept him in touch with goings-on at the bridge.’