fade out

fade out (http://definr.com/fade out)

     v 1: become weaker, as of sound or vision; "The sound faded out"
          [syn: dissolve, fade away]
     2: become less clearly visible or distinguishable; disappear
        gradually or seemingly; "The scene begins to fade"; "The
        tree trunks are melting into the forest at dusk" [syn: fade,
         melt]