\Whew\ (hw[=u]), n. & interj.
A sound like a half-formed whistle, expressing astonishment,
scorn, or dislike.
{Whew duck}, the European widgeon. [Prov. Eng.]

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