whew

interjection

Pronunciation: /hwjuː/ / /fjuː/

An expressive sound made indicating the release of one's inner tension; the release of breath; an expression of relief.
“(from strenuous labour) Whew! That box weighs a ton!”
“(from intense concern) Whew! Thank goodness youʼre safe! I thought something terrible had happened to you!”
An expression of amazement or surprise.
“Now I must be off. Whew, it's as cold as the North Pole. Which way is the wind blowing?”