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]

WordNet (r) 3.0 (2006):

Coventry
    n 1: the state of being banished or ostracized (excluded from
         society by general consent); "the association should get
         rid of its elderly members--not by euthanasia, of course,
         but by Coventry" [syn: banishment, ostracism,
         Coventry]
    2: an industrial city in central England; devastated by air
       raids during World War II; remembered as the home of Lady
       Godiva in the 11th century