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perhaps alteration (influenced by hair entry 1) of het up; from the tendency of the hair on a person's head or an animal's back to stand on end as a result of extreme excitement
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“Hared up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hared%20up. Accessed 7 Aug. 2022.
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