Dictionary / Vocabulary / 告げ口
つげぐち
telling (on someone); tattling; snitching
Also written つげ口、告口
いらぬ告げ口をして彼らの結婚生活に波風を立てることはない。
There's no need to tell on him and mess up their marriage.
僕の告げ口をするな。
Don't tell on me.
彼はもちろん私の事を社長に告げ口するだろう。
He will, no doubt, tell the boss on me.