to make flustered or confused; to disconcert or agitate.
From 'be-' plus 'fluster,' which derives from Scandinavian sources meaning to hurry or confuse. 'Be-' intensifies the action of flustering.
While 'fluster' survives in modern English, its intensive form 'befluster' has nearly vanished—but it shows how 'be-' once let speakers fine-tune emotional intensity before adverbs like 'completely' took over.
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