noun
bullet climb; speed climb without proper rest
Refers to climbing a mountain, especially Mt. Fuji, in a single rapid push without overnight stays or recommended rest stops, often associated with altitude sickness risk.
弾丸登山は高山病のリスクが高い。
Bullet climbing carries a high risk of altitude sickness.
富士山の弾丸登山が問題になっている。
Bullet climbing on Mt. Fuji has become a problem.
Compound of 弾丸 (bullet) and 登山 (mountain climbing), literally 'bullet climb', referring to a rapid ascent without rest.