1. [n]  a spontaneous loss of consciousness caused by insufficient blood to the brain
2. [v]  pass out from weakness, physical or emotional distress due to a loss of blood supply to the brain

Swoon
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1. \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.
                                                  ii. 11.
         The most in years . . . swooned first away for pain.
                                                  --Dryden.
         He seemed ready to swoon away in the surprise of joy.
                                                  --Tatler.
   

2. \Swoon\, n.
   A fainting fit; syncope.