no obj.
1- faint from extreme emotion昏倒：
I don't want a nurse who swoons at the sight of blood.
我不需要一看到血就昏倒的护士。
1.1
- be emotionally affected by someone or something that one admires; become ecstatic激动; 狂喜：
the administration is so busy swooning over celebs that it has lost its senses.
行政部门对名人的到来过于激动以至于都不知道该干什么了。
- an occurrence of fainting昏厥：
her strength ebbed away and she fell into a swoon.
她的力气越来越小, 然后就昏倒了。
词源
Middle English: the verb from obsolete swown 'fainting', the noun from aswoon 'in a faint', both from Old English geswōgen 'overcome'.