Expression of relief

• Exclamation of exertion
• 'Boy, that was close!'
• 'Close call!'
• "That was close"
• "Man, that was close!"
• Hot-day word
• "Glad that's over"

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Whew \Whew\, v. i. To whistle with a shrill pipe, like a plover. [Prov. Eng. & Scot.]

Wiktionary Word definitions in Wiktionary
interj. 1 An expressive sound made indicating the release of one's inner tension; the release of breath; an expression of relief. 2 An expression of amazement or surprise. vb. (context UK Scotland dialect English) To whistle with a shrill pipe, like a plover. ...