swoon

Short definition from Wiktionary

Noun

1. 1
   A faint.
2. 2
   An infatuation.

Verb

1. 1
   To faint, to lose consciousness.
2. 2
   To be overwhelmed by emotion, especially infatuation.
3. 3
   To overwhelm with emotion, especially infatuation.
4. 4
   To make a moan, sigh, or some other sound expressing infatuation or affection.