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get (someone) wrong
To misunderstand someone. Don't get me wrong, I appreciate everything your mother has done for us—but it's time for her to get her own place. You've got him all wrong—he's a total sweetheart, he just seems tough.
get (something) wrong
To do, understand, or answer something inaccurately and/or incorrectly. I sure didn't ace the exam, but I hope I didn't get too many wrong. Take your time—you'll just end up making more work for yourself if you get it wrong the first time. That electrician got the wiring wrong, and now nothing in the house will turn on!
get someone (all) wrong
to misunderstand someone's intentions or character. I think you've got me all wrong. I want to be your friend, not your enemy.