godan verb (-tsu), intransitive verb
rise up; take action; rouse oneself
Archaic or literary verb meaning to stand up and act, often with a connotation of resolve or uprising. In modern Japanese, 立つ (sense 10) is used for this meaning.
See also: 立つ
彼は困難に直面しても起つことを選んだ。
He chose to rise up even when faced with hardship.
古い文献では「起つ」が行動を起こす意味で使われる。
In old texts, 起つ is used to mean taking action.