The Collaborative International Dictionary of English v.0.48:
Swoon \Swoon\, v. i. [imp. & p. p. Swooned; p. pr. & vb. n.
Swooning.] [OE. swounen, swoghenen, for swo?nien, fr.
swo?en to sigh deeply, to droop, AS. sw[=o]gan to sough,
sigh; cf. gesw[=o]gen senseless, swooned, gesw[=o]wung a
swooning. Cf. Sough.]
To sink into a fainting fit, in which there is an apparent
suspension of the vital functions and mental powers; to
faint; -- often with away.
The sucklings swoon in the streets of the city. --Lam.
The most in years . . . swooned first away for pain.
He seemed ready to swoon away in the surprise of joy.