use one's head

idiom

: to think carefully
Maybe if we use our heads, we can figure this out.

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Usenet
use one's head
use one's heads
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“Use one's head.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/use%20one%27s%20head. Accessed 3 Jul. 2025.

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