Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
open ocean waters outside the territorial limits of any single nation
Used by arrangement with John Wiley & Sons, Inc.
plural nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The open waters of an ocean or a sea beyond the limits of the territorial jurisdiction of a country: piracy on the high seas.
high seas - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Open waters of an ocean or sea, beyond the territorial jurisdiction of a country. For example, Commercial fishermen are being forced to go out on the high seas in order to make a living. [c. 1100]