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British Dictionary definitions for dragon's teeth

dragon's teeth

pl n
  1. informal conical or wedge-shaped concrete antitank obstacles protruding from the ground in rows: used in World War II
  2. sow dragon's teeth to take some action that is intended to prevent strife or trouble but that actually brings it about
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Word Origin

sense 2 from the story of Cadmus
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