underwater

/AH1 N D ER0 W AO0 T ER0/
noun
  1. 1

    Underlying water or body of water, for example in an aquifer or the deep ocean

  2. 2

    A type of lure which lies beneath the water surface.

verb
  1. 1

    To water or irrigate insufficiently

    โ€œCare must be taken not to underwater houseplants in the summer.โ€

Antonyms

adjective
  1. 1

    Beneath the surface of the water, or of or pertaining to the region beneath the water surface

  2. 2

    Beneath the water line of a vessel

  3. 3

    Under water.

  4. 4

    Having negative equity; owing more on an asset than its market value

    โ€œWe've been underwater on our mortgage ever since the housing crash.โ€

adverb
  1. 1

    Going beneath the surface of the water

Source: https://en.wiktionary.org/wiki/underwater