dampen (http://definr.com/dampen)

     v 1: smother or suppress; "Stifle your curiosity" [syn: stifle]
          [ant: stimulate]
     2: make moist; "The dew moistened the meadows" [syn: moisten,
     3: deaden (a sound or noise), esp. by wrapping [syn: muffle,
        mute, dull, damp, tone down]
     4: reduce the amplitude (of oscillations or waves)
     5: quieten or silence (a sound) or make (an image) less visible
        [syn: muffle, mute, deaden, damp, tone down]
     6: check; keep in check (a fire)
     7: lessen in force or effect; "soften a shock"; "break a fall"
        [syn: damp, soften, weaken, break]