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be mistaken

if you are mistaken, you are wrong about something that you thought you knew or saw:
It can't have been my car. You must be mistaken.
I thought he said 12 o'clock, but I might have been mistaken.
We bought the rug in Turkey, if I'm not mistaken.

mistaken belief/idea/impression/view etc

a mistaken belief etc is not correct:
Marijuana has few withdrawal effects, and this has given rise to the mistaken belief that it is not addictive.
mistakenly adverb

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