Source : Webster's Revised Unabridged Dictionary (1913)

Fleer \Fleer\, [imp. & p. p. {Fleered}; 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.

            To fleer and scorn at our solemnity.  --Shak.

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

            Grinning and fleering as though they went to a bear
            baiting.                              --Latimer.