tache (tæ?; t???) narchaic a buckle, clasp, or hook[C17: from Old French, of Germanic origin; compare tack1]tache (tæ?) n (Hairdressing & Grooming) informal short for moustacheCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014