spare tire
US /ˈsper ˌtaɪər/
UK /ˈsper ˌtaɪər/
1.
an extra tire carried in a vehicle, for use if another tire goes flat
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Make sure you have a spare tire in your trunk before a long trip.
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I had a flat tire, but luckily I had a spare tire to change it.
2.
a roll of fat around a person's waist
:
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He's trying to get rid of his spare tire by exercising more.
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After the holidays, I always seem to gain a little spare tire.