depress

lower someone's spirits; make downhearted; "These news depressed her"; "The bad state of her child's health demoralizes her"

lower (prices or markets); "The glut of oil depressed gas prices"

cause to drop or sink; "The lack of rain had depressed the water level in the reservoir"

press down; "Depress the space key"

lessen the activity or force of; "The rising inflation depressed the economy"