to press down; to cause to sink; to let fall; to lower; as, to depress the muzzle of a gun; to depress the eyes.-to bring down or humble; to abase, as pride.-to cast a gloom upon; to sadden; as, his spirits were depressed.-to lessen the activity of; to make dull; embarrass, as trade, commerce, etc.-to lessen in price; to cause to decline in value; to cheapen; to depreciate.-to reduce (an equation) in a lower degree.-having the middle lower than the border; concave.