De
Down
Sub
Under
To make less to become smaller
Decrease
Downhearted in low spirits unhappy
Dejected
to lower in rank or position to move down or back
Demote
The numeral below the line or to the right of the line in a fraction
Denominator
To come down to go from a higher to a lower place
Descend
To bring under control to quiet down to conquer
Subdue
The title or heading for one section of an outline or paper
Subheading
The title or heading for one section of an outline or paper
Submerge
To go down we see settle sink to a lower level
Subside
The minimum amount to sustain life
Subsistence