Past tense and past participle of 'girn'; showed one's teeth in a grimace or snarl.
Regular past tense formation from 'girn' (to grin or grimace) plus the standard '-ed' ending (Old English '-ede'). This is a straightforward inflection of the Scots/Northern English dialect verb.
Girned represents how English verb conjugation follows predictable patterns—almost any verb can take '-ed' to become past tense, which is why English is easier to learn than languages requiring irregular verb forms. However, in some dialects, 'girned' might also appear as 'girn' (no change) since dialect verbs sometimes resist standardization.
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