FLACKER
Etymology
Verb
flacker (third-person singular simple present flackers, present participle flackering, simple past and past participle flackered)
(intransitive) To flutter like a bird.
(intransitive) To flicker; to quiver.
Anagrams
• Fackler
Source: Wiktionary
Flack"er, v. i. Etym: [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.]
Definition: To flutter, as a bird. [Prov. Eng.] Grose.
Source: Webster’s Unabridged Dictionary 1913 Edition