French leave
noun
1.
a departure without ceremony, permission, or notice:
Taking French leave, he evaded his creditors.
Origin
1765-75
British Dictionary definitions for
French leave
French leave
noun
1.
an unauthorized or unannounced absence or departure
Word Origin
C18: alluding to a custom in France of leaving without saying goodbye to one's host or hostess
Slang definitions & phrases for
French leave
French leave
noun phrase
Departure without notice or permission, esp going AWOL from a military post
(1771+)