What is the meaning of depress?

verb

• Lower someone's spirits; make downhearted.
  • usage: "These news depressed her"; "The bad state of her child's health demoralizes her"
  • synonyms: deject, cast down, get down, dismay, dispirit, demoralize, demoralise
• Lower (prices or markets. )
  • usage: "The glut of oil depressed gas prices"
• Cause to drop or sink.
  • usage: "The lack of rain had depressed the water level in the reservoir"
  • synonyms: lower
• Press down.
  • usage: "Depress the space key"
  • synonyms: press down
• Lessen the activity or force of.
  • usage: "The rising inflation depressed the economy"