To grin, grimace, snarl, or show one's teeth in a facial expression, especially when angry or disgusted.
From Middle English and Old Norse origin, related to Old Norse 'girna' (to snarl). The word appears in Scots and Northern English dialects and may be connected to 'grin' through metathesis or semantic drift.
Girn is a wonderfully expressive Scots and Northern English dialect word that's survived for centuries—it appeared in literature as far back as the 16th century. The word captures a specific facial expression (somewhere between a grin and a snarl) that's hard to describe in standard English, showing how dialects preserve emotional nuance that gets lost in broader language standardization.
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