coast ‧ guard /ˈkəʊstɡɑːd $ ˈkoʊstɡɑːrd/ BrE AmE noun
1 . the Coastguard [ also + plural verb British English ] the organization that helps swimmers and ships that are in danger and helps to prevent illegal activities around the coast:
the Coastguard station at Stornoway
Contact the Coastguard immediately if you see a boat in trouble.
2 . [countable] British English a member of this organization