The Collaborative International Dictionary
Qvacked
Quack \Quack\, v. i. [imp. & p. p. Qvacked; p. pr. & vb. n. Quacking.] [Of imitative origin; cf. D. kwaken, G. quacken, quaken, Icel. kvaka to twitter.]
To utter a sound like the cry of a duck.
To make vain and loud pretensions; to boast. `` To quack of universal cures.''
--Hudibras.To act the part of a quack, or pretender.