To become damped or deadened.
To lessen; to dull; to make less intense (said of emotions and non-physical things).
To become damp or moist.
To make damp or moist; to make moderately wet.
To bring down or humble; to abase (pride, etc.).
To cause a depression or a decrease in parts of the economy.
To make depressed, sad or bored.
To press down.
To reduce (an equation) in a lower degree.