The Collaborative International Dictionary of English v.0.48:

Dew \Dew\, v. t. [imp. & p. p. Dewed; p. pr. & vb. n.
   Dewing.]
   To wet with dew or as with dew; to bedew; to moisten; as with
   dew.
   [1913 Webster]

         The grasses grew
         A little ranker since they dewed them so. --A. B.
                                                  Saxton.
   [1913 Webster]