noun
solo hiking; solo climbing; solo travel
Refers to outdoor activities such as hiking, mountaineering, or traveling alone, often with an emphasis on self-reliance.
彼は単独行で北アルプスを縦走した。
He traversed the Northern Alps solo.
単独行の魅力は、自分のペースで歩
The appeal of solo hiking is being able to walk at your own pace.
General term for solo travel, not limited to outdoor activities.
Compound of 単独 (solo, alone) and 行 (going, travel). The exact historical derivation is uncertain, but the word is a straightforward modern coinage for solo outdoor activities.