Definition of “put ideas into sb's head” - English Dictionary

british dictionary

“put ideas into sb's head” in British English

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put ideas into sb's head

to make someone want to do something they had not thought about before, especially something stupid:

Don't go putting ideas into his head. We can't afford a new car.

(Definition of “put ideas into sb's head” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)