By pumping water or air into the ballast tanks.
ascend and descend
Fall-Rise Descend- Ascend
Descend.
Width
Width
Depth
Width
Depth. To ascend is to go up, and to descend is go down. We measure the height of things above the ground and the depth of things below the ground.
lift.... Gravity
The opposite is descend (go down the stairs).
The antonyms for deduct is to add, to increase, to raise.
She would descend down the stairs at midnight.