Quack /(?)/

imp. & p. p. Qvacked; p. pr. & vb. n. Quacking

1. To utter a sound like the cry of a duck.
2. To make vain and loud pretensions; to boast.
3. To act the part of a quack, or pretender.

1. The cry of the duck, or a sound in imitation of it; a hoarse, quacking noise.
2. A boastful pretender to medical skill; an empiric; an ignorant practitioner.
3. Hence, one who boastfully pretends to skill or knowledge of any kind not possessed; a charlatan.

   Quacks political; quacks scientific, academical.

1. Pertaining to or characterized by, boasting and pretension; used by quacks; pretending to cure diseases; as, a quack medicine; a quack doctor.