Sharp, keen, or quick-witted; having a lively intelligence or understanding, used in Scottish English.
From Middle English and Scottish glegg, possibly related to Old Norse glöggr meaning 'bright' or 'sharp-eyed.' Remains primarily a Scottish dialect word.
Scottish English preserved 'gleg' from Old Norse, while standard English let the word almost disappear—it's like finding a linguistic fossil that shows what medieval English sounded like.
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