exclamation Whew is used in writing to represent a sound that you make when you breathe out quickly, for example because you are very hot, very relieved, or very surprised. [feelings] ⇒ 'Whew,' he said. 'It's hot.' ⇒ You were just in time. Whew! What a close call. ⇒ 'Whew! What is that terrible smell?' she cried.
COBUILD Advanced English Dictionary. Copyright © Harper Collins Publishers