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wash sale

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noun
  1. a sale of a stock at a loss and repurchase of the same or substantially identical stock within 30 days, for which the capital loss is disallowed for tax purposes.
  2. the simultaneous purchase and sale of large amounts of a stock or commodity by the same speculator so as to give a false appearance of wide market activity and interest in the stock or commodity.

Origin of wash sale

An Americanism dating back to 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for wash sale

wash sale

noun
  1. US the illegal stock-exchange practice of buying and selling the same securities at an inflated price through a colluding broker to give the impression that the security has a strong market
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