Definition of "open sea" []

• That part of the sea out of sight of land. (noun)

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• "Seaplane operations in the open sea were inherently difficult: any combination of light wind, fog, and rough seas hampered takeoff."
• "If he made a half turn to his left, he could see Long Island, the farms and houses of Brooklyn Village at the foot of the Old Ferry Road, and out to the open sea beyond Gravesend."
• "From their separate stations in Philadelphia and Baltimore, Morris and Richard Henry Lee schemed constantly to deploy the few armed vessels of the Continental Navy to open sea lanes and escort cargo ships, but to little effect."