noun
jumping off; jumping down
Refers to the act of jumping off or down from a height, such as a platform, vehicle, or building. Often used in contexts like 飛び降り自殺 (suicide by jumping).
彼は電車から飛び降りた。
He jumped off the train.
飛び降り自殺は増えている。
Suicides by jumping are increasing.
飛び込む means 'to jump into' (e.g., water, a situation), while 飛び降り specifically means 'to jump off/down from a height'.
Compound of 飛び (tobi, 'jumping', the continuative form of 飛ぶ) and 降り (ori, 'descending', the continuative form of 降りる).