tube

ot noun

1. An approximately cylindrical container, usually with a crimped end and a screw top, used to contain and dispense semiliquid substances. A tube of toothpaste.
2. (often capitalized as Tube) 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.
3. A television. Are you just going to sit around all day and watch the tube?
4. Anything that is hollow and cylindrical in shape.

fe’l verb

1. To supply with, or enclose in, a tube. She tubes lipstick in the cosmetics factory.
2. To ride an inner tube. They tubed down the Colorado River.
3. To intubate. The patient was tubed.