I'll show you

I'll show you

1. Used other than figuratively or idiomatically: see show.
2. prove someone wrong; overturn prejudices; seek vindication

   I'll show them who's the failure in this family!

   • 2018 August 1, Jacqui Bealing, quoting Winfried Hensinger, “Progress in Quantum Technology”, in The w:University of Sussex‎:

     Athletics gave me persistence as a teenager. [...] I used to train eight times a week. Even in the middle of winter I would break into the stadium and shuffle through snow on the track. [...] Building a quantum computer is like space travel to Mars. For many years, people said this is completely impossible. That's what got me into this field. I thought, I'll show you.

   • 2011, Robert Riggs, War in the Land of Morning Calm: A Korean War Novel‎, →ISBN, page 3:

     "Hey Jack," Bobby said, changing the subject. "Did you notice Bernie in front of the formation tonight? When he saluted Major Reynolds he jiggled. He's gained some weight. Better get in shape if he's going to war."
     "Don't you believe it, Jarhead," Bernie retorted. "Step outside. I'll show you who's out of shape!" They all laughed.

   • 1993 September 20, Arthur Lubow, “George Wolfe in Progress”, in w:The New Yorker‎:

     "The fact that I was a [Broadway] director of color directing this play was the most important banner I wanted to wave," he said. "Because I'm breaking a boundary there. Whereas, if the [homo]sexuality is stressed, that excuses on a certain level the racial thing," [...] He had returned to his home town of Frankfort, Kentucky, for George C. Wolfe Week. He didn't recall feeling oppressed by segregation while he was growing up, but, as the returning hero, he felt the childhood emotions flooding back. "It was so interesting, walking into these tiny little shops and going, ‘What was so precious here that a little six-year-old boy couldn't touch, couldn't walk inside of?' " he said. "Or the Capitol Theatre—they wouldn't let me go in there? Oh, it's a parking lot now? Good. The first eleven years of my life came rushing back to me with a certain sort of rage. I thought, I'll show you. And it wasn't George Wolfe showing you. It was a little black boy showing you."

   • 1993 March 6, “The Unstoppable Juggernaut”, in w:X-Men: The Animated Series, season 1, episode 8:

     [Jubilee blinds Juggernaut with brief flare]
     Juggernaut: What's this, the 4th of July? No one told me.
     Jubilee: Leave him alone!
     Wolverine: Jubilee, don't.
     Juggernaut: [Laughs] What's she gonna do, hit me with her diaper?
     Jubilee: I'll show you, you overgrown trash can!
     [Jubilee vents a stream of plasma behind Juggernaut, almost topples him]

I'll show you

1. vow vengeance
   • 2010 August 11, “Second follow-up to the report of the United Nations Fact-Finding Mission on the Gaza Conflict”, in UNGA‎, page 104:

     I was taken into custody by Preventive Security ... The moment I went in to the investigator, he asked me why I had not saluted him, and I replied that I was in a confused state of mind. And because I had not saluted him, he said to me, "I'll show you!" and called in a soldier who held me firmly from behind while blows from the investigator rained down on me. He then escorted me to the torture yard, where the investigator fell upon me, [...]

• “I'll show you”, in Collins English Dictionary.
• “I'll show him/them etc” in Longman Dictionary of Contemporary English, Longman.
• “I'll show you/him/them etc” (US) / “I'll show you/him/them etc” (UK) in Macmillan English Dictionary.