noun, noun or participle which takes 'suru', intransitive verb
secret communication with the enemy; collusion; betrayal
Refers to secretly communicating with an opposing side, often in contexts of war, politics, or business, implying betrayal of one's own group.
彼は敵と内通していた疑いで逮捕された。
He was arrested on suspicion of having secretly communicated with the enemy.
内通者が組織の情報を外部に流した。
A mole leaked the organization's information to the outside.
noun, noun or participle which takes 'suru', intransitive verb
adultery; extramarital affair
A dated or literary term for adultery; modern Japanese more commonly uses 不倫 or 浮気.
古い小説では、妻の内通が悲劇の原因として描かれることがある。
In old novels, a wife's adultery is sometimes depicted as the cause of a tragedy.