in one's head

idiom

: without needing to write anything down : mentally

She did some quick calculations in her head.

Examples of in one's head in a Sentence

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There are a number of ways to help get rid of the bastards once they are stuck in one's head, but what if there were a way to avoid earworms altogether? —

Seriously Science, Discover Magazine, 30 Apr. 2015

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“In one's head.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20one%27s%20head. Accessed 25 Dec. 2024.

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