give somebody ideas
give (one) ideas
To suggest something to someone; to lead someone to start believing (in) something; to make someone want to start doing something. (Used of suggestions, ideas, or beliefs that one wouldn't have thought of on his or her own, especially those that are foolish or negative.) Of course we're not going to sell the house! Who gave you such ideas? I can't believe you were caught smoking marijuana. I bet it's that no-good kid Casey who gave you ideas like that. I heard that John's been giving his sister ideas that she was adopted.