warhorse
/ˈwɔːhɔːs/noun
1- (in historical contexts) a powerful horse ridden in a battle（用于历史）战马。
1.1
- informal an elderly person such as a soldier, politician, or sports player who has fought many campaigns or contests〈非正式〉身经百战的老兵; 老练的政客; 经验丰富的运动员。