1A patrol sent to keep watch over an area along a country's border.
2Border PatrolAn agency within the US Department of Homeland Security responsible for preventing the entry of illegal immigrants as well as terrorists and their weapons into the United States.
Definition of border patrol in US English:
border patrol
noun
1A patrol sent to keep watch over an area along a country's border.
2Border PatrolAn agency within the US Department of Homeland Security responsible for preventing the entry of illegal aliens as well as terrorists and their weapons into the United States.