Etymology
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flitter (v.)

"fly with back-and-forth motion," 1540s, from flit with frequentative suffix. Flitter-mouse (1540s) is occasionally used in English, in imitation of German fledermaus "bat," from Old High German fledaron "to bat, to flutter." Related: Flittered; flittering. As a noun, from 1892.

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Definitions of flitter

flitter (v.)
move back and forth very rapidly;
Synonyms: flicker / waver / flutter / quiver
From wordnet.princeton.edu