Source : Webster's Revised Unabridged Dictionary (1913)

Depress \De*press"\, v. t. [imp. & p. p. {Depressed}; p. pr. &
   vb. n. {Depressing}.] [L. depressus, p. p. of deprimere; de-
   + premere to press. See {Press}.]
   1. To press down; to cause to sink; to let fall; to lower;
      as, to depress the muzzle of a gun; to depress the eyes.
      ``With lips depressed.'' --Tennyson.

   2. To bring down or humble; to abase, as pride.

   3. To cast a gloom upon; to sadden; as, his spirits were
      depressed.

   4. To lessen the activity of; to make dull; embarrass, as
      trade, commerce, etc.

   5. To lessen in price; to cause to decline in value; to
      cheapen; to depreciate.

   6. (Math.) To reduce (an equation) in a lower degree.

   {To depress the pole} (Naut.), to cause the sidereal pole to
      appear lower or nearer the horizon, as by sailing toward
      the equator.

   Syn: To sink; lower; abase; cast down; deject; humble;
        degrade; dispirit; discourage.

Depress \De*press"\, a. [L. depressus, p. p.]
   Having the middle lower than the border; concave. [Obs.]

         If the seal be depress or hollow.        --Hammond.

Source : WordNet®

depress
     v 1: lower someone's spirits; make downhearted; "These news
          depressed her"; "The bad state of her child's health
          demoralizes her" [syn: {deject}, {cast down}, {get down},
           {dismay}, {dispirit}, {demoralize}, {demoralise}] [ant:
           {elate}]
     2: lower (prices or markets); "The glut of oil depressed gas
        prices"
     3: cause to drop or sink; "The lack of rain had depressed the
        water level in the reservoir" [syn: {lower}]
     4: press down; "Depress the space key" [syn: {press down}]
     5: lessen the activity or force of; "The rising inflation
        depressed the economy"