The term "giving one an idea" is often used to describe the act of inspiring or suggesting a concept or thought to someone else. When searching for antonyms for this phrase, we can consider words that convey the opposite meaning - where one is not providing or eliciting an idea. Some antonyms could include "withholding information," "keeping thoughts to oneself," "being discreet," or "maintaining silence." Alternatively, words such as "blocking imagination," "suppressing innovation," or "hindering creativity" could also illustrate the opposite of inspiring new concepts or ideas. Overall, antonyms for "giving one an idea" emphasize the absence or lack of sharing insights, rather than actively discouraging innovation.