slip someone's mind/memory

idiom

informal
: to be forgotten by someone
Her birthday completely slipped my mind.

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“Slip someone's mind/memory.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/slip%20someone%27s%20mind%2Fmemory. Accessed 27 Feb. 2025.

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