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inner tube

noun

  1. a doughnut-shaped, flexible rubber tube inflated inside a tire to bear the weight of a vehicle.


inner tube

noun

  1. an inflatable rubber tube that fits inside a pneumatic tyre casing
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of inner tube1

First recorded in 1890–95
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Example Sentences

“Also, do not tie two or more inner tubes together; this requires you to have a life jacket for each person. Kids 12 and younger must wear a life jacket.”

Pomeroy’s family told Portland Monthly that the accident occurred when their inner tubes, which were tied together, flipped over in fast-moving currents after hitting a snag on the Willamette River.

From Salon

Consider the analogy of trying to capture a 3D image of a child wearing an inner tube around their waist.

The smugglers had handed out motorcycle inner tubes as flotation devices with instructions not to inflate them until the boat was on its way to England.

From BBC

More than 2.5 million people take their power boats or kayaks or inner tubes out on the Willamette River system annually.

From Salon

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Inner Templeinner-tuber