An archaic or dialectal term for a bumblebee or any large bee.
From 'bum' (an imitative word representing the humming sound) combined with 'bee,' this is a folk term for the buzzing insect that onomatopoetically describes its sound.
Before anyone called them 'bumblebees,' people said 'bumbees'—it's pure onomatopoeia, where 'bum' literally imitates the low buzzing sound fat bees make.
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