deep-water

Short definition from Wiktionary

Adjective

1. 1
   Having a great depth of water.
2. 2
   Carried out at great depth.
3. 3
   Located in or near deep ocean waters.
4. 4
   Living at a great depth underwater

Noun

1. 1
   Used other than figuratively or idiomatically: see deep, water.
2. 2
   Waters suitable for deep-draft ships, especially ocean-going.
3. 3
   A difficult or embarrassing situation.

Proper noun

1. 1
   A census-designated place in Fayette County, West Virginia, United States.