tube (tubes plural )
1 n-count A tube is a long hollow object that is usually round, like a pipe.
He is fed by a tube that enters his nose., ...a cardboard tube.
2 n-count A tube of something such as paste is a long, thin container which you squeeze in order to force the paste out.
oft N of n
...a tube of toothpaste., ...a small tube of moisturizer.
3 n-count Some long, thin, hollow parts in your body are referred to as tubes.
The lungs are in fact constructed of thousands of tiny tubes.
4 n-sing The tube is the underground railway system in London.
(BRIT) the N, also by N
I took the tube then the train and came straight here...
5 n-count You can refer to the television as the tube.
(AM)
INFORMAL the N
(=TV)
The only baseball he saw was on the tube.
in BRIT, use the box
6 If a business, economy, or institution goes down the tubes or goes down the tube, it fails or collapses completely.
(mainly AM)
INFORMAL
♦
go down the tube(s) phrase V inflects
The country was going down the tubes economically...
7
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bronchial tube
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cathode-ray tube
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fallopian tube
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inner tube
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test tube