put ideas in/into someone's head

idiom

: to cause someone to have ideas or suspicions that he or she would not have had otherwise
Don't go putting ideas in/into his head.

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“Put ideas in/into someone's head.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/put%20ideas%20in%2Finto%20someone%27s%20head. Accessed 27 Feb. 2025.

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