grind in
grind in
vb
(General Engineering) (tr, adverb) engineering to make (a conical valve) fit its seating by grinding them together in the presence of an abrasive paste
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014