spare tire

1.
USglobalneutralliteral
- A replacement wheel and tyre carried in a vehicle for use in the event of a puncture or other tyre failure.
2.
USUKglobalinformalcolloquial
- A ring of excess fat around a person's waist; abdominal fat that protrudes over the beltline.
3.
USUKglobalinformalcolloquialderogatory
- A secondary or backup person kept for convenience or as an alternative, often used in reference to a romantic partner or support role.
- An extra or reserve asset retained for occasional or opportunistic use.

Examples: