(intransitive) to fall (to move downwards under the effect of gravity) / (intransitive) to fall, to be defeated / (intransitive) to rain, to snow, to hail / (intransitive) to be mentioned, to be brought up, to be asked / (intransitive, chiefly of animals) to die / (intransitive, hyperbolic, informal) to be very tired / (intransitive, colloquial) to break (to stop fuctioning)

(transitive, idiomatic) to fall victim [+genitive = to something]

(intransitive, idiomatic) to drop like flies