Anonymous is flutter an onomatopoeia This source claims that 'flutter' derives from 'float'. allowed_in_frame=0&search=flutter&searchmode=none When I pronounce the 'fl' sound, that does in fact remind me of a butterfly FLuttering with its wings, or a bird 'FLapping' its wings. I do think 'flutter' could be an onomatopoeic expression, but often the problem is that we can't trace words back all the way to when they came into existence.
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Anonymous is flutter an onomatopoeiaThis source claims that 'flutter' derives from 'float'. http://www.etymonline.com/index.php?allowed_in_frame=0&search=flutter&searchmode=none