Moisture; humidity; water.
"Yet oft they quit | The dank, and rising on siff pennons, tow'r | the mid aerial sky"
Dark, damp and humid.
The dank cave was chilly and spooky.
(of marijuana) Highly potent.
That was dank bud.
(often ironic) Great, awesome.
To moisten, dampen; used of mist, dew etc.
A small silver coin formerly used in Persia.