off the top of one's head

phrase

: in an impromptu manner
… sat down and wrote the … story off the top of his head.Jerome Beatty, Jr.

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“Off the top of one's head.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/off%20the%20top%20of%20one%27s%20head. Accessed 11 Dec. 2025.

Last Updated: - Definition revised
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