Webster’s Revised Unabridged Dictionary · 1913
Flacker
Flack′er (flăk′ẽr), v. i. [OE. flakeren, fr. flacken to move quickly to and fro; cf. icel. flakka to rove about, AS. flacor fluttering, flying, G. flackern to flare, flicker.] To flutter, as a bird. [Prov. Eng.] Grose.