Used to express relief or satisfaction after a difficult or unpleasant situation. Phew, I'm glad that's over!
Used to indicate that someone is hot or tired. Phew, it's really hot outside today!
Used to express surprise or amazement. Phew, I can't believe how fast you ran!
Used to express disgust or reaction to an unpleasant smell or situation. Phew, something in the fridge has gone bad!