Sometimes Offensive. a departure without ceremony, permission, or notice: Taking French leave, he evaded his creditors.
Origin of French leave
First recorded in 1765–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
an unauthorized or unannounced absence or departure
Word Origin for French leave
C18: alluding to a custom in France of leaving without saying goodbye to one's host or hostess
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012