Definitions of depress:

• verb:   lessen the activity or force of

  Example: "The rising inflation depressed the economy"

• verb:   lower someone's spirits; make downhearted

  Example: "These news depressed her"

• verb:   lower (prices or markets)

  Example: "The glut of oil depressed gas prices"

• verb:   press down

  Example: "Depress the space key"

• verb:   cause to drop or sink

  Example: "The lack of rain had depressed the water level in the reservoir"