depressv. t.[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.(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.()()a.[L. depressus, p. p.] Having the middle lower than the border; concave.()If the seal be depress or hollow. (Hammond.)