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Quack

Definition: To utter a sound like the cry of a duck.

Quack

Definition: To make vain and loud pretensions; to boast.

Quack

Definition: To act the part of a quack, or pretender.

Quack

Definition: The cry of the duck, or a sound in imitation of it; a
hoarse, quacking noise.

Quack

Definition: A boastful pretender to medical skill; an empiric; an
ignorant practitioner.

Quack

Definition: Hence, one who boastfully pretends to skill or knowledge of
any kind not possessed; a charlatan.

Quack

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