from The American Heritage® Dictionary of the English Language, 4th Edition
- interj. Used to express relief, fatigue, surprise, or disgust.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- interj. Used to show relief, fatigue, surprise, or disgust.
from The Century Dictionary and Cyclopedia
- An exclamation of disgust, weariness, or surprise.
An onomatopoeia: the sound of rapid exhalation one makes when some trying situation is over. (Wiktionary)