noun, noun or participle which takes 'suru', intransitive verb
putting an idea into someone's head; suggestion; hint
Often carries a negative nuance, implying unsolicited or manipulative advice. Used as a noun or with する to mean giving someone an idea, especially one they wouldn't have thought of themselves.
彼はいつも人に入れ知恵をしてトラブルを起こす。
He always puts ideas into people's heads and causes trouble.
あの子がそんなことを言うなんて、誰かに入れ知恵されたに違いない。
There's no way that kid would say something like that; someone must have put the idea in his head.