Cry after a close call

• Forehead-wiping word
• 'That was close!'
• "Man, it's hot!"
• "That was exhausting!"
• Voiced sigh of relief
• Expression of relief
• "That was a close call!"
• "Good thing we locked the door before the monster got in"

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.

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. ...