gag-bit
gag-bit
n
(Horse Training, Riding & Manège) a powerful type of bit used in breaking horses
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014