"warhorse" in the noun sense
a work of art (composition or drama) that is part of the standard repertory but has become hackneyed from much repetition
2. veteran, old-timer, oldtimer, old hand, warhorse, old stager, stager
an experienced person who has been through many battles someone who has given long service
horse used in war
Source: WordNet® (An amazing lexical database of English)
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