To water or irrigate insufficiently.
A type of lure which lies beneath the water surface.
Underlying water or body of water, for example in an aquifer or the deep ocean.
In difficulty, especially financially.
Of an option, having a strike price higher (call options) or lower (put options) than the current market price of the underlying asset or financial product; for example, an option to buy shares at $20 when the current market price is $15.
Beneath the surface of the water; of or pertaining to the region beneath the water surface.
Having negative equity; owing more on an asset than its market value.
Beneath the water line of a vessel.
So as to go beneath the surface of the water.