bump start
n (Automotive Engineering) 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
vb (Automotive Engineering) (tr) to start (a motor vehicle) using this method
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014