interjection
whew
WHYOO/hwjuː/
An exclamation expressing a release of strong feeling.
Whew, I'm glad we finally have that problem behind us.

Etymology
Whew originated as an imitation of a whistling sound, rather than a combination of meaningful roots. Its recorded use as an exclamation of astonishment connects that expressive sound with surprise.
In context
Whew I drew two deep breaths.
More examples
- Whew, I need a break after carrying all those boxes!
- Whew, that's more money than I make in a year!
- Whew, everyone is safe and the fire is out.
Similar words
- phew
- Closely overlaps with whew, especially for relief or exhaustion.
- wow
- Emphasizes surprise or admiration rather than relief or exhaustion.