Swoon (verb)

1. To become unconscious or dizzy, typically as a result of a sudden emotion or physical weakness.
2. To react with excessive or uncontrollable emotion or pleasure.

Origin:

From the middle english word "swounen", from the old english "swogan" meaning "to faint".

Examples:

1. She swooned at the sight of him.
2. He swooned from the heat and had to be carried out of the room.
3. The news made her swoon with joy.
4. She swooned over his romantic gestures.
5. The concert goers swooned over the band's new song.