1a long, hollow cylinder of metal, plastic, glass, etc. for holding or transporting something, chiefly liquids or gases:a plastic tube is connected to the tap and the beer is ready to be pulled
the inner tube of a bicycle tyre.
[mass noun] material in a tubular form; tubing:the firm manufactures steel tube for a wide variety of applications
2a thing in the form of or resembling a tube, in particular:
a flexible metal or plastic container sealed at one end and having a screw cap at the other, for holding a semi-liquid substance ready for use:a tube of toothpaste
a rigid cylindrical container:a tube of Smarties
Australian informal a can of beer:a tube of lager
[usually with adjective or noun modifier] Anatomy, Zoology, & Botany a hollow cylindrical organ or structure in an animal body or in a plant (e.g. a Eustachian tube, a sieve tube).
(tubes) informal a woman’s fallopian tubes:women with blocked tubes
a woman’s close-fitting garment, typically without darts or other tailoring and made from a single piece of stretch fabric: [as modifier]:a tube skirt
(in surfing) the hollow curve under the crest of a breaking wave:he angled his board to get in the tube
informal a cigarette:as soon as the no-smoking light dies she reaches for the tubes
3 (the Tube) British trademark the underground railway system in London:a cross-London trek on the Tube
a train running on the Tube:I caught the tube home
4a sealed container, typically of glass and either evacuated or filled with gas, containing two electrodes between which an electric current can be made to flow.
a cathode ray tube, especially in a television set:colour tubes for portables
(the tube) North American informal television:watching the tube in a country bar
North American a thermionic valve.
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1 (usually as adjective tubed) provide with a tube or tubes: [in combination]:a giant eight-tubed hookah
2 informal fit (a person or animal) with a tube to assist breathing, especially after a laryngotomy.
3 [with adverbial] convey in a tube:the wells were flooded, and this water, tubed off, yielded a supply of 38,000 gallons per hour
4 (tube it) British informal travel on the Tube:we tubed it back to Queensway [no object]:I tubed to St Pancras
go down the tube (or tubes)
informal be completely lost or wasted; fail utterly:the country is going slowly and surely down the tubes
