cascader

Two senses: literally, to fall or flow in cascades (l'eau cascade sur les rochers, ses cheveux cascadent sur ses épaules), and — from the film industry — to perform stunts as a cascadeur/cascadeuse (stuntman/stuntwoman), the source of the noun cascade meaning 'stunt.'

• L'eau cascadait le long des rochers. — The water cascaded down the rocks.
• Il cascade dans les films d'action depuis dix ans. — He's been doing stunts in action films for ten years.
• Ses boucles cascadent jusqu'au milieu du dos. — Her curls cascade halfway down her back.

The stunt-performing sense only makes sense with a person as subject and usually a film/cinema context — don't use it for ordinary physical falls or accidents, where tomber or chuter is correct.