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Related to French leave: French kiss
An informal, unannounced, or abrupt departure.
[From the 18th-century French custom of leaving without saying goodbye to the host or hostess.]
an unauthorized or unannounced absence or departure
[C18: alluding to a custom in France of leaving without saying goodbye to one's host or hostess]
a departure without ceremony, permission, or notice: Taking French leave, he evaded his creditors.
French leave- Comes from the French custom of leaving a ball or dinner without saying goodbye to the host or hostess.
See also related terms for host.