get ideas

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get (any) ideas

To have thoughts or schemes about a particular person or situation. Often used in the negative. I know you're excited that your parents are going out, but don't get any ideas—I'll be here watching you all night.
See also: get, idea

get (or give someone) ideas

become (or make someone) ambitious, big-headed, or tempted to do something against someone else's will, especially make a sexual advance. informal
See also: get, idea