Underlying water or body of water, for example in an aquifer or the deep ocean
A type of lure which lies beneath the water surface.
To water or irrigate insufficiently
Care must be taken not to underwater houseplants in the summer.
Beneath the surface of the water, or of or pertaining to the region beneath the water surface
Beneath the water line of a vessel
Under water.
Having negative equity; owing more on an asset than its market value
We've been underwater on our mortgage ever since the housing crash.
Going beneath the surface of the water