by mistake

idiom

: because of a mistake : without intending to
I got on the wrong train by mistake.

Examples of by mistake in a Sentence

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Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
He had been promoted—by mistake. Carrie Johnson, NPR, 10 Sep. 2025 Arizona prison officials aren't saying much about how a man was released by mistake 22 years early. Lorenzino Estrada, AZCentral.com, 10 Sep. 2025 But by mistake, Trey’s friend Kyle – the boy of King’s longtime associate Paul (Jeffrey Wright) – is the one being held, and King works with the police to pay the culprits and get the kid back. Brian Truitt, USA Today, 5 Sep. 2025 According to Johns Hopkins Medicine, MS is a chronic disease of the central nervous system in which the body’s immune system attacks itself by mistake. Ryan Brennan, Miami Herald, 29 Aug. 2025 See All Example Sentences for by mistake

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“By mistake.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/by%20mistake. Accessed 13 Sep. 2025.

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