In Scottish English, a term for a river channel or watercourse, or sometimes a wooden peg or post.
From Old Norse origins, possibly related to 'dúk' meaning channel or ditch, preserved in Scottish Gaelic and English dialects of Scotland and Northern England.
Scottish English preserves a lot of Norse vocabulary because of Viking settlements in Scotland—'dook' is a perfect example of how languages layer on top of each other geographically, with Norse words still alive in Scottish speech.
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