Third person singular present tense of 'girn'; grins, grimaces, or snarls.
From Scots 'girn' plus standard '-s' ending (Old English '-es', third person singular present tense marker). Regular verb conjugation following the productive suffix pattern in English.
Girns shows how verb conjugation works in modern Scots—it follows the same '-s' pattern used in English ('he grinds,' 'she runs'). However, in spoken Scots, speakers might not always mark singular clearly, showing how written and spoken dialect can diverge.
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