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12th century, in the meaning defined above
Middle English, alteration of grinnen to grin, snarl
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From the Editors at Merriam-Webster
The History of 'Girn'
'Girn' began as a spelling variant of 'grin', but quickly took on a meaning of its own
Cite this Entry
“Girn.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/girn. Accessed 20 Sep. 2020.
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