To make moist
To decrease or dull the sound of
Even the red sun couldn't dampen her mood.
The system of making-ready employed now is quite different from that in use when it was necessary to dampen paper before it could be satisfactorily printed.
Use cold water, dampen a sponge and work from the center of the stain with gentle outward strokes.
With the underdog team refusing to let ill-fortune dampen enthusiasm, things improved in the fourth match against Eastwood Park.
Some children find that using weights on the arms can help dampen the worst of the uncoordinated arm movements.