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English definition of “coastguard”

coastguard

noun     /ˈkəʊst.ɡɑːd/ US  /ˈkoʊst.ɡɑːrd/
[C] an official who is employed to watch the sea near to a coast for ships that are in danger or involved with illegal activitiesEmergency services in general the coastguard [S] the official organization that coastguards belong toNamed organizations and societies and their membersEmergency services in general
(Definition of coastguard noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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