noun, noun or participle which takes 'suru', intransitive verb
going alone; travelling by oneself
Used for going or travelling alone, often as a noun or with する. Can also appear in compounds like 単行本 (standalone book) or 単行路線 (independent line).
彼は単行で旅に出た。
He set out on a journey alone.
単行するのは初めてだ。
This is my first time going alone.
noun
doing independently; doing separately
Often used in compounds to mean independent or separate action. As a standalone noun, it can refer to doing something on one's own rather than as part of a group.
このプロジェクトは単行で進める。
We will proceed with this project independently.
単行の判断で決めた。
I decided on my own judgment.