To suggest something to one, to lead one to start believing (in) something, or to cause one want to start doing something. Used of suggestions, ideas, or beliefs that one wouldn't have thought of on their 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. I bet it's that no-good Casey who gave you ideas like that. I heard that John's been giving his sister ideas that she was adopted.