Definition of get (or give someone) ideas in US English:

get (or give someone) ideas

phrase

informal
  • Become (or make someone) ambitious, bigheaded, or tempted to do something against someone else's will, especially make a sexual advance.

    ‘Mac began to get ideas about turning pro’
    • ‘I do not appreciate the rest of you saying I do either, probably giving her ideas.’
    • ‘‘Don't go giving her ideas,’ he warned in a whisper.’
    • ‘It was a wedding hot spot: what if a fortnight around nauseating newlyweds gave her ideas?’
    • ‘According to Silberstein, there are even those who worry that his recent success as an artist will give him ideas, as though he were the Phantom of the Opera, and had suddenly decided to climb onstage and sing Tosca at the Met.’
    • ‘Media violence just adds to the problem and gives them ideas about how to express their anger.’
    • ‘I read that to Archer, along with the part about you not sharing for fear of giving him ideas.’
    • ‘On second thoughts, let's not give Gordon ideas.’
    • ‘‘Hey now, don't start giving her ideas,’ Matt said.’
    • ‘In fact, this line of argument should stop here, in case it gives them ideas.’
    • ‘I don't want to give them ideas, but I'm looking forward to the derby.’