chin-chin sentence substitute informal a greeting, farewell, or toast [C18: from Chinese (Peking) ch’ing-ch’ing please-please]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014