- the status of full-time service: on active duty.
esp US active duty
- military duty in an operational area
Idioms and Phrases with active service
Full-time service, as in Julian is 81, but he still comes to the office every day and is very much on active duty. This term comes from the military, where it stands in opposition to reserve, which refers to troops still in the military but not actively engaged. It is occasionally transferred to civilian matters as well. [First half of 1800s]