Used to introduce the person or thing performing an action, meaning "by"; often used in the 为...所 wéi... suǒ pattern.

law; statutes; legality; (bound form) Legalism; relating to the Legalist School of thought

(bound form) self; oneself; one's own; refers to an action done by oneself or to oneself

(literary) (bound form) tired; exhausted; worn out; decayed; in decline