Depress

verb

1. To press down.

   "Depress the upper lever to start the machine."

2. To make depressed, sad or bored.

   "Winter depresses me."

3. To cause a depression or a decrease in parts of the economy.

   "Lower productivity will eventually depress wages."

4. To bring down or humble; to abase (pride, etc.).
5. To reduce (an equation) in a lower degree.