underwater

under +‎ water

underwater (comparative more underwater, superlative most underwater)

1. (not comparable) beneath the surface of the water, or of or pertaining to the region beneath the water surface
2. (nautical) beneath the water line of a vessel
3. (figuratively) Under water.
4. (finance) having negative equity; owing more on an asset than its market value

   We've been underwater on our mortgage ever since the housing crash.

   • 2013 May 13, Matthew MacCaull as Matt Bronstein, Underwater (Bates Motel), episode 9, A&E:

     You're underwater. The best thing you can do is just walk away. Let the bank take it back.

• (beneath the water surface): subaqueous, subaquatic, submarine
• (having negative equity): upside down

• underground
• underseas

underwater (comparative more underwater, superlative most underwater)

1. going beneath the surface of the water

underwater (plural underwaters)

1. underlying water or body of water, for example in an aquifer or the deep ocean
2. (fishing) A type of lure which lies beneath the water surface.
   • 1923, Sheridan R. Jones, Bait Casting: The Short Rod and How to Use It‎, page 57:

     Practically all wobbling underwaters will take fish aplenty in the hands of a man who really knows how to put them through their stints.

underwater (third-person singular simple present underwaters, present participle underwatering, simple past and past participle underwatered)

1. (agriculture, horticulture) to water or irrigate insufficiently

   Care must be taken not to underwater houseplants in the summer.

• overwater

• underwater on Wikipedia.Wikipedia