tick-over

tick-over

n
Brit (of an engine) the act of running at a low speed or rate, for example when an engine is switched on, but one is not actually using it
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014