choke chain


noun
  1. a collar and lead for a dog so designed that if the dog drags on the lead the collar tightens round its neck

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