The story
Intentionally truncated form of *autokataballesis from auto- + Ancient Greek καταβάλλω (katabállō) + -esis, in the sense of "act of throwing oneself down".
Etymology from Wiktionary, CC BY-SA 4.0.
autokabalesis
Today it means: Jumping from a significant height to the ground as an act of suicide or due to psychiatric disorder. Full definition →