1. guard ship
Wikipedia definition
2. Guard shipA guard ship is a warship stationed at some port or harbour to act as a guard, and in former times in the Royal Navy to receive the men impressed for service. She usually was the flagship of the admiral commanding on the coast. A guard-boat is a boat which goes the round of a fleet at anchor to see that due watch is kept at night. In Soviet terminology a guard ship (Storozhevoj Korabl') is a small, general purpose patrol and/or escort vessel.
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Read “警備艦” on Japanese Wikipedia
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