peace ‧ keep ‧ ing /ˈpiːsˌkiːpɪŋ/ BrE AmE adjective [only before noun]
peacekeeping force/troops etc a group of soldiers who are sent to a place in order to stop two opposing groups from fighting each other:
The United Nations has decided to send a peacekeeping force into the area.
—peacekeeper noun [countable] :
a group of UN peacekeepers