The Collaborative International Dictionary of English v.0.48:

Fleeten \Fleet"en\, n.
   Fleeted or skimmed milk. [Obs.]
   [1913 Webster]

   Fleeten face, a face of the color of fleeten, i. e.,
      blanched; hence, a coward. "You know where you are, you
      fleeten face." --Beau. & Fl.
      [1913 Webster]