a sharp, telling remark, act, gesture, etc., made in departing.
Origin of Parthian shot
First recorded in 1900–05; so called from the ancient Parthian cavalry's habit of shooting arrows rearward at the enemy while in real or feigned flight
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Word Origin for Parthian shot
alluding to the custom of Parthian archers who shot their arrows backwards while retreating
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