Meaning of “spare tire” in the English Dictionary

"spare tire" in American English

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spare tirenoun [ C ]

/ˈspeər ˈtɑɪər/

spare tire noun [ C ] (EXTRA TIRE)

also spare an extra tire for a car

spare tire noun [ C ] (FAT)

a layer of fat around a person's waist:

I was determined to get some exercise and lose my growing spare tire.

(Definition of “spare tire” from the Cambridge Academic Content Dictionary © Cambridge University Press)