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flat tire

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noun
  1. a pneumatic tire that has lost all or most of its air through leakage, puncture, or the like.
  2. Older Slang. a dull or socially inept person.
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Origin of flat tire

First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018