Close-call cry

• Sound of relief
• Sound heard during a heat wave
• "I'm glad that's over!"
• "Glad that's over!"
• "Boy, it's hot!"
• ''Thank goodness!''
• Exclamation like a half-formed whistle
• "Man, it's hot!"

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
exclamation of astonishment, etc., early 15c., a whistling sound, of imitative origin.

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.]