head-scratch·er
| \ ˈhed-ˌskra-chər
\
\
plural head-scratchers
Definition of head-scratcher
informal
: something that is confusing, mysterious, or hard to understand
We love college football for nothing if not the belief—hope even—that at any moment the unexpected could happen. Young as it is, this season has already provided its share of jaw-droppers and head-scratchers.— Holly Anderson
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“Head-scratcher.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/head-scratcher. Accessed 4 Mar. 2021.
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The first known use of head-scratcher was in 1902
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