"caer repentinamente" in English

to tumble- to come down- to descend- to drop away- to flow- to go down- to hang- to land- to pitch- to plonk- to plunge- to plunk- to sag- to shower- to sit- to strike- to go down- to rake- to blow in- to catch on- to twig- to fall- to drop- to fall down- to take a fall- to plump- to be caught- to die- to fall over- to lose one's job- to show up- to turn up- to be- to chip in

sharply- abruptly- suddenly