• (v. i.) To flutter, as a bird.
Flack'er intransitive verb [ Middle English flakeren , from flacken to move quickly to and fro; confer icel. flakka to rove about, Anglo-Saxon flacor fluttering, flying, German flackern to flare, flicker.] To flutter, as a bird. [ Prov. Eng.] Grose.