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by someone's reckoning

idiom

: according to someone's calculations
By her reckoning, he should be in his 80s by now.

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“By someone's reckoning.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/by%20someone%27s%20reckoning. Accessed 27 Nov. 2025.

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