Usage Note
Desmayar (transitive) means 'to make someone faint or lose courage,' but the much more common use is reflexive: desmayarse ('to faint, to pass out'). Se desmayó de calor means 'she fainted from the heat.' The noun is desmayo ('fainting spell'); sin desmayo is an idiom meaning 'without faltering, tirelessly.'
Examples
"Se desmayó al ver la sangre."
Natural Translation
She fainted when she saw the blood.
Literal Translation
Herself fainted upon seeing the blood.
Related Words
Explore Spanish by topic