grey market

  1. a system involving the secret but not illegal sale of goods at excessive pricesCompare black market
  2. stock exchange a market in the shares of a new issue, in which market makers deal with investors who have applied for shares but not yet received an allotment
  3. the market for goods and services created by older people with a comfortable disposable income and increased opportunities for spending it
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012