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UK [tjuːb] / US [tub] noun
Word forms "tube":
singular tube plural tubes

1)

a) [countable] a long narrow object similar to a pipe that liquid or gas can move through

Nurses had to feed Dan through a tube.

b) an object shaped like part of a pipe

a toilet paper tube

2) [countable] a long narrow plastic or metal container with a lid at one end that you squeeze in order to push out the soft substance inside

tube of:

a tube of toothpaste

a) a large container shaped like a tube used for storing things like papers, maps, and pictures

b) a small container shaped like a tube for holding sweets or other food

c) Australian informal a can of drink, especially beer

3)

a) the tube or the Tube

British informal the system of underground trains in London

a tube station/platform/train

on the tube:

Guess who I saw on the tube tonight?

by tube:

She goes to work by tube.

b) an underground train in London

What time's the last tube?

4) [countable] a long thin part inside your body that is shaped like a tube

fallopian tubes

5) [countable] a cathode ray tube

6) the tube

American informal television

•

go down the tubes/tube — informal to fail completely; informal to be wasted

This company is going down the tubes.

Theresa could see all her good work going down the tubes.