flat tire

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flat tire (plural flat tires)

1. (chiefly American spelling) Alternative spelling of flat tyre
2. (US, slang, dated) A bore; a person who is no fun.

   Synonyms: pill, square, wet blanket

   • 2020, Nancy Shew Bolton, Love Stumbled In:

     Sam scowled at him. “You're always such a flat tire. Live a little for once.”
     A twinge of pity for Judd made Carrie speak. “He's not a flat tire. He just doesn't want to.”

• flat tire rule

• filtrate, triflate