war-horse

[ wawr-hawrs ]
/ ˈwɔrˌhɔrs /

noun

a horse used in war; charger.
Informal. a veteran, as a soldier or politician, of many struggles and conflicts.
a musical composition, play, etc., that has been seen, heard, or performed excessively.

Origin of war-horse

First recorded in 1645–55; war1 + horse
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for warhorse

warhorse

/ (ˈwɔːˌhɔːs) /

noun

a horse used in battle
informal a veteran soldier, politician, or elderly person, esp one who is aggressive
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