The Collaborative International Dictionary of English v.0.48:

Whew \Whew\ (hw[=u]), n. & interj.
   A sound like a half-formed whistle, expressing astonishment,
   scorn, or dislike.
   [1913 Webster]

   Whew duck, the European widgeon. [Prov. Eng.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Whew \Whew\, v. i.
   To whistle with a shrill pipe, like a plover. [Prov. Eng. &
   Scot.]
   [1913 Webster]