Phew (interjection)

1. Used to express relief, especially from heat, exertion, or discomfort.
2. Used to express mild disappointment, disapproval, or dismay.

Origin:

This word is likely imitative in origin and likely has no specific etymology.

Examples:

1. Phew, it's hot in here!
2. Phew, I thought I lost my keys.
3. Phew, that was a close call.
4. Phew, I"m glad that"s over.
5. Phew, I don't know if I can handle this heat.