- To utter a sound like the cry of a duck.
- To make vain and loud pretensions; to boast.
- To act the part of a quack, or pretender.
- The cry of the duck, or a sound in imitation of it; a
hoarse, quacking noise.
- A boastful pretender to medical skill; an empiric; an
- Hence, one who boastfully pretends to skill or knowledge of
any kind not possessed; a charlatan.
- Pertaining to or characterized by, boasting and pretension;
used by quacks; pretending to cure diseases; as, a quack medicine; a