flacker

From Middle English flakeren (“to flutter, waver”), from Old English *flacorian, from Proto-West Germanic *flakurōn, from Proto-Germanic *flakurōną (“to flutter”), related to Old English flacor (“flickering, fluttering”). Sometimes regarded as a frequentative, equivalent to flack +‎ -er (frequentative suffix).

Akin to Middle Dutch flakkeren (“to flicker, waver”), German flackern (“to flare, flicker, flutter”), Icelandic flökra (“to flutter”), Icelandic flakka (“to rove about”), Old English flacor (“flying, fluttering”). See also flack, flicker.

flacker (third-person singular simple present flackers, present participle flackering, simple past and past participle flackered)

1. (intransitive) To flutter like a bird.
   • 1535, Myles Coverdale, Bible, Ezekiel x. 19:

     And the cherubins flackered with their wings.

2. (intransitive) To flicker; to quiver.

• Fackler

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flacker

1. inflection of flackern:
   1. first-person singular present
   2. singular imperative