Definition of the high seas noun from the Oxford Advanced Learner's Dictionary

 

the high seas

 noun
noun
BrE
 
; NAmE
 
[plural](formal or literary) Coastlines and the sea, Travelling by boat or ship
 
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the areas of sea that are not under the legal control of any one country international laws to regulate fishing on the high seas a film about pirates seeking adventure on the high seas See related entries: Coastlines and the sea, Travelling by boat or ship
See the Oxford Advanced American Dictionary entry: the high seas