(bound form) scholar; intellectual; member of the educated class in ancient China, as in the phrase 士农工商 shì​nóng​gōng​shāng

for; because of; in order to; for the sake of; used to indicate the purpose or recipient of an action

A very close or bosom friend who understands one's heart; someone with whom one shares a deep and mutual understanding

(bound form) used after a verb, adjective, or noun to represent the person or thing performing an action or possessing a quality; translates as "-er", "-ist", or "one who"

to die for a cause; to sacrifice one's life for someone or something