noun (Coast Guard)
a branch of the US armed forces, under the Department of Transportation since 1967, responsible for the enforcement of maritime law and for the protection of life and property at sea. In time of war, or at the direction of the president, the Coast Guard serves as part of the US Navy.
) a civilian or volunteer organization keeping watch on the sea near a coast in order to assist people or ships in danger and to prevent smuggling.
a member of a federal or civilian coast guard organization.