Nail-biter's cry

• 'That was close!'
• "That was a close one!"
• "Boy, it's hot!"
• Exclamation like a half-formed whistle
• "Glad that's over!"
• Forehead wiper's exclamation
• "Glad that's done"
• "Barely made it!"

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
interjection EXAMPLES FROM OTHER ENTRIES ▪ Whew , it's hot outside.

Wikipedia Word definitions in Wikipedia
WHEW (1380 AM , "Bonita 1380") is an American radio station licensed to serve the community of Franklin, Tennessee . The station's broadcast license is held by SG Communications, Inc.