Wiktionary
alt. 1 (&lit spare tire) 2 (context North America English) An extra wheel carried as a replacement in case of a flat. 3 (context North America idiomatic English) Excess weight or fat accumulated near the waist. n. 1 (&lit spare tire) 2 (context North America English) An extra wheel carried as a replacement in case of a flat. 3 (context North America idiomatic English) Excess weight or fat accumulated near the waist.
WordNet
n. excess fat around the waistline [syn: love handle]
Wikipedia
A spare tire or spare tyre (or stepney) is an additional tire (or tyre - see spelling differences) carried in a motor vehicle as a replacement for one that goes flat, a blowout, or other emergency. Spare tire is generally a misnomer, as almost all vehicles actually carry an entire wheel with a tire mounted on it as a spare rather than just a tire, as fitting a tire to a wheel would require a motorist to carry additional, specialized equipment. However, some spare tires ("space-saver" and "donut" types) are not meant to be driven long distances. Space-savers have a maximum speed of around .