high seas

Noun

high seas pl (plural only)

1. (plural, plural-only) The regions of the ocean that are far from shore, especially those regions that do not belong to any country.
   • I'm reading a romance of piracy on the high seas.
   • From the ground, Colombo’s port does not look like much. . . . For mariners leaving the port after lonely nights on the high seas, the delights of the B52 Night Club and Stallion Pub lie a stumble away.2013 June 8, “The new masters and commanders”, in The Economist, volume 407, number 8839, page 52

   Synonyms:

   open ocean, open sea

2. (Internet, plural, plural-only) The regions of the Internet in which piracy (i.e. copyright infringement) is prevalent.
   • I was out on the high seas yesterday and got myself a new mathematics book.