put ideas into someone’s head

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Harry might well change if she were to meet him again after an absence of two years, but she bit back her words, fearing that the suggestion, were she to make it, might put the idea into his head. Let it suffice for the present that he thought he’d been silly to nurture romantic thoughts about his first love.

She was a witch, then, because he had never before in his life done such a thing with a girl in the street. She must have put the idea into his head herself: pinned it onto the back of his mind, like one of her flaming hairpieces.

That’s Dora all over, interrupted Rose with a sniff. Once she gets an idea into her head, wild horses won’t shift it.

(BNC-B)

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