1.InterjectionAn expressive sound made indicating the release of one's inner tension; the release of breath; an expression of relief.
" Whew! That box weighs a ton!; Whew! Thank goodness youʼre safe! I thought something terrible had happened to you!; Whew! That cop didnʼt see me! That was a close call!"
2.InterjectionAn expression of amazement or surprise.
3.VerbTo whistle with a shrill pipe, like a plover.