noun
dropping headfirst down a precipice
Specifically refers to the act of throwing or dropping something (or someone) upside down from a cliff or high place. Often associated with historical or dramatic contexts, such as executions or battle tactics.
戦国時代には、捕虜を逆落としにする処刑方法があった。
In the Warring States period, there was an execution method of dropping prisoners headfirst from a cliff.
noun
downhill rush; plunging down a precipice
Describes a rapid, headlong descent down a steep slope, often in sports like skiing or mountain biking, or in a metaphorical sense of a swift downward movement.
スキーヤーが急斜面を逆落としに滑り降りた。
The skier rushed downhill headlong down the steep slope.
Compound of 逆 (saka, 'reverse, upside down') and 落とし (otoshi, 'dropping'), from the verb 落とす (otosu, 'to drop'). The reading さか is an older form of さかさま (sakasama, 'inverted').