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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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, 1 Aug. 2025 One comment in particular stuck with her — a follower who shared that their neighbor’s child with Down syndrome had picked their flowers by mistake, prompting a heartfelt apology the next day. Ashley Vega, People.com, 30 July 2025 Considering the world only learned Tom Holland and Zendaya were even dating by mistake, that almost feels like a full-circle moment for their relationship. Lizzie Lanuza, StyleCaster, 29 July 2025 In early 2022, a spreadsheet containing details of Afghans who had worked for the British government prior to the Taliban takeover in 2021 and had applied for relocation to Britain was emailed to someone outside of government systems by mistake. CNN Money, 16 July 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 21 Aug. 2025.

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