whew
interj. B1 Intermediate US //ˈhju// UK //fjˈuː// whew
interj. a sound you make to show you are relieved or tired. You use it after a difficult or scary situation is finally over.
interj. an utterance expressing relief, fatigue, or surprise at having narrowly avoided a negative outcome.
Whew, I finally finished that long report.
Whew, that was a close call; I almost missed the train as the doors were closing.
The lead climber reached the summit and let out a long, audible whew, signaling to the team below that the most dangerous pitch was behind them.
Usage
Typically stands alone as a sentence or acts as an introductory exclamation followed by a comma.