One who wanders or dawdles; a person who loiters aimlessly (Scottish).
From 'daunder' plus the agent noun suffix '-er,' creating a word for a person who performs the action. This appears in Scottish English dialect.
The '-er' suffix for creating agent nouns is one of the most ancient and productive in English—from Old English 'bæcere' (baker) to modern 'computer hacker,' it's constantly creating new person-words.
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