in the mistaken/erroneous belief that

phrase

: being mistaken in thinking that
Many people arrived early in the mistaken/erroneous belief that free tickets would be available.

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“In the mistaken/erroneous belief that.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20the%20mistaken%2Ferroneous%20belief%20that. Accessed 6 Mar. 2026.

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