bump start

noun
  1. a method of starting a motor vehicle by engaging a low gear with the clutch depressed and pushing it or allowing it to run down a hill until sufficient momentum has been acquired to turn the engine by releasing the clutch
verb bump-start
  1. (tr) to start (a motor vehicle) using this method
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