noun
A spare tire is an extra tire carried in a vehicle for emergency use in case of a flat tire.
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It is important to always have a spare tire in your vehicle in case of emergencies.
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Make sure you have a spare tire in your car just in case you get a flat.
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Don't forget to pack a spare tire in your ride for any unexpected blowouts.
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Having a backup plan is like having a spare tire for life's unexpected challenges.