noun, noun or participle which takes 'suru', intransitive verb
leaving one's domain; becoming a lordless samurai
Historical term referring to a samurai abandoning their feudal domain and lord, often to become a ronin. Used both as a noun and as a suru-verb.
彼は脱藩して浪人になった。
He left his domain and became a ronin.
脱藩は重
Leaving one's domain was considered a serious crime.