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English definition of “tube”

tube

noun (TRAIN)    /tjuːb/ US  /tuːb/
the tube B1 [S] (often the Tube) UK informal London's underground train system: I got the Tube to Camden Town. I go to work on the tube. a Tube stationRailways and railway lines
(Definition of tube noun (TRAIN) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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