to send to coventry

from The Collaborative International Dictionary of English v.0.48

Coventry \Cov"en*try\ (k?v"en-tr?), n.
   A town in the county of Warwick, England.
   [1913 Webster]

   {To send to Coventry}, to exclude from society; to shut out
      from social intercourse, as for ungentlemanly conduct.

   {Coventry blue}, blue thread of a superior dye, made at
      Coventry, England, and used for embroidery.
      [1913 Webster]