The Collaborative International Dictionary of English v.0.48:

fleer \fleer\ (fl[=e]r), [imp. & p. p. fleered (fl[=e]rd); p.
   pr. & vb. n. fleering.] [OE. flerien; cf. Scot. fleyr,
   Norw. flira to titter, giggle, laugh at nothing, MHG. vlerre,
   vlarre, a wide wound.]
   1. To make a wry face in contempt, or to grin in scorn; to
      deride; to sneer; to mock; to gibe; as, to fleer and
      flout.
      [1913 Webster]

            To fleer and scorn at our solemnity.  --Shak.
      [1913 Webster]

   2. To grin with an air of civility; to leer. [Obs.]
      [1913 Webster]

            Grinning and fleering as though they went to a bear
            baiting.                              --Latimer.
      [1913 Webster]