Definition from Wiktionary, the free dictionary
- spare tire (North America)
spare tyre (plural spare tyres)
- An extra tyre carried in case one of the vehicle's tyres is damaged or deflated.
- (idiomatic) A large stomach and rolls of fat around the waist.
- Spare tire is generally a misnomer, as almost all vehicles actually carry an entire wheel with a tire mounted on it as a spare.