godan verb (-su), suru verb (precursor), transitive verb
use as an intermediary; mediate; assist
Used when someone or something serves as a go-between or facilitator. Often appears in the pattern ～を介して (through, via). The verb form 介す is somewhat literary; in modern Japanese 介する is more common.
See also: 介する
彼は友人を介してその情報を手に入れた。
He obtained the information through a friend.
This problem was resolved through a third party.
godan verb (-su), suru verb (precursor), transitive verb
Rare and somewhat archaic; expresses concern or caring about something. In modern Japanese, 気にする or 心配する are far more common. This sense is mostly encountered in older texts.
See also: 介する
古い小説では、「人の目を介す」という表現が見られる。
In old novels, you can find the expression 'to mind what others think'.