French leave

an unauthorized, unnoticed, or unceremonious departure; act of leaving secretly or in haste

Origin: < 18th-c. custom, prevalent in France, of leaving receptions without taking leave of the host or hostess

See French leave in American Heritage Dictionary 4

noun

An informal, unannounced, or abrupt departure.

Origin:

Origin: From the 18th-century French custom of leaving without saying goodbye to the host or hostess

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