Flacker

Origin

From Middle English flakeren ("to flutter, waver"), frequentative of Middle English flaken ("to move quickly back and forth"). Akin to Old 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.

Full definition of flacker

Verb

1. to flutter as a birdAnd the cherubins flackered with their wings. --Ezek. x. 19 (Coverdale's translation)
2. to flicker, quiver