Definitions for flacker
to flutter as a bird
And the cherubins flackered with their wings. --Ezek. x. 19 (Coverdale's translation)
to flicker, quiver
Origin: From flakeren, frequentative of flaken. Akin to flakkeren, flackern, flökra, flakka, flacor. See also flack, flicker.
to flutter, as a bird