the world > movement > motion in a certain direction > downward motion > [noun] > sinking down > instance of (5)
Chiefly Scottish. A sinking or settling down of the ground, or of any structure built on it; (Mining) a subsidence or collapse due to undercutting…
gen. An instance or act of sinking (in various senses).
An instance of subsiding, falling back, or sinking down; (as a mass noun) subsidence. Now rare.
A sinking in; a depression.
That which sinks or has been sunk; a depression.