Jumping off: the act of leaping down from a high place; often used in contexts of dangerous acts, accidents, or suicide.
ビルからの飛び下りは危険で命に関わる。
Jumping off a building is dangerous and life-threatening.
線路への飛び下り事故が発生した。
There was an incident of someone jumping onto the tracks.
山の崖からの飛び下りはやめなさい。
Don't jump off the cliff on the mountain.