Definition of HM Coastguard from the Oxford Advanced Learner's Dictionary

 

HM Coastguard

 
BrE
 
; NAmE
 
Her/His Majesty's Coastguard
 
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the British government organization, part of the Maritime and Coastguard Agency (MCA), whose job is to watch the country's coast and help ships and people in trouble at sea and on the land near the sea.