ME swounde, swounden < swounen, swoon, with unhistoric -d
swound in American English
(swaund, swuːnd)
intransitive verb or noun
archaic
swoon
Word origin
[1400–50; late ME swounde (v.), var. (with excrescent d) of swoune to swoon]This word is first recorded in the period 1400–50. Other words that entered Englishat around the same time include: curl, partition, peg, structure, union