tube

Anything that is hollow and cylindrical in shape.

But then I had the [massive] flintlock by me for protection. ¶[…]The linen-press and a chest on the top of it formed, however, a very good gun-carriage; and, thus mounted, aim could be taken out of the window […], and a 'bead' could be drawn upon Molly, the dairymaid, kissing the fogger behind the hedge, little dreaming that the deadly tube was levelled at them.

An approximately cylindrical container, usually with a crimped end and a screw top, used to contain and dispense semiliquid substances.

A tube of toothpaste.

The London Underground railway system, originally referred to the lower level lines that ran in tubular tunnels as opposed to the higher ones which ran in rectangular section tunnels. (Often the tube.)

I took the tube to Waterloo and walked the rest of the way.

He took the tube to Westminster and disappeared.

The London Underground railway system, originally referred to the lower level lines that ran in tubular tunnels as opposed to the higher ones which ran in rectangular section tunnels. (Often the tube.)

And thus it came about that on that October morning I found myself in the deep level tube with the Professor speeding to the North of London in what proved to be one of the most singular experiences of my remarkable life.

A tin can containing beer.

It's alright to cop a warm tube of Fosters and a cold pie 'n' peas when you're dated by one of the locals[.]

Tinnie: a tin of beer — also called a tube.

To supply with, or enclose in, a tube.

She tubes lipstick in the cosmetics factory.

To ride an inner tube.

They tubed down the Colorado River.

To intubate.

The patient was tubed.

The London Underground.

But 'Tube' is used as shorthand for the whole network, not least by London Underground itself, [...] It tends to be older people who hold on to the distinction. A friend of mine was visiting his mother who lives about 500 yards from Parsons Green station on the District, which is a cut-and-cover line [not a tube line]. At the end of the evening she said, "How are you getting back?" He said, "Oh, on the Tube", and she looked at him absolutely blankly. "What Tube?" she said, "There is no Tube here."

Still, it’s not just the decline of civilisation that worries me, nor the (related) effect on Tube manners (Candy Crushers are rarely very chivalrous).