desfallecer

to faint

to become weak

desfallecer(dehs-fah-yeh-sehr)

intransitive verb

1. (to lose consciousness)

a. to faint

Desfallecí al ver la sangre que salía de la herida.

I fainted when I saw the blood coming out of the wound.

b. to pass out

Estaba tan mareada que me sentía a punto de desfallecer.

I felt so dizzy I was about to pass out.

2. (to lose strength)

a. to become weak

Después de correr tanto me desfallecieron las piernas y me senté a descansar.

My legs became weak after running so far, so I sat down to rest.

b. to flag

Julio no estaba en forma y comenzó a desfallecer a poco de empezar a nadar.

Julio wasn't very fit and began to flag soon after he started swimming.

c. to fail (strength)

Se había agarrado a la rama durante varios minutos pero sentía que le desfallecían las fuerzas.

He had held on to the branch for some minutes but he could feel that his strength was failing.