'warhorse' definitions:

Definition of 'warhorse'

(from WordNet)
noun
A work of art (composition or drama) that is part of the standard repertory but has become hackneyed from much repetition
noun
An experienced person who has been through many battles; someone who has given long service [syn: veteran, old- timer, oldtimer, old hand, warhorse, old stager, stager]
noun
Horse used in war