Definitions:
go down below the surface of something, especially of a liquid; become submerged

descend from a higher to a lower position; drop downwards

gradually decrease or decline in value, amount, quality, or intensity

insert beneath a surface

rapidly consume (an alcoholic drink)

a fixed basin with a water supply and outflow pipe

a pool or marsh in which a river's water disappears by evaporation or percolation.

a place of vice or corruption