Present participle of dander: moving or going slowly and aimlessly, or shedding dander.
From 'dander,' which may derive from Dutch or have uncertain origins, with the present participle suffix '-ing' (from Old English).
Dandering as 'wandering aimlessly' is a wonderful regional term—it captures the specific kind of purposeless strolling we all do when we're procrastinating or lost in thought.
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