on active duty

n civilians trained as soldiers but not part of the regular army n formality and propriety of manner n something kept back or saved for future use or a special purpose n an athlete who plays only when a starter on the team is replaced n (medicine) potential capacity to respond in order to maintain vital functions n a district that is reserved for particular purpose n armed forces that are not on active duty but can be called in an emergency n the trait of being uncommunicative