verb

lose consciousness for a short time because of a temporarily insufficient supply of oxygen to the brain.

I fainted from loss of blood

pass out,lose consciousness,fall unconscious,black out,collapse,flake out,keel over,conk out,zonk out,drop,go out,go out like a light,swoon

noun

a sudden loss of consciousness.

she hit the floor in a dead faint

blackout,fainting fit,loss of consciousness,collapse,coma,swoon,syncope