Definition - Quack

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Quack

the harsh sound of a duck
an untrained person who pretends to be a physician and who dispenses medical advice
act as a medical quack or a charlatan
utter quacking noises; "The ducks quacked"
To utter a sound like the cry of a duck.
The cry of the duck, or a sound in imitation of it; a hoarse, quacking noise.
Pertaining to or characterized by, boasting and pretension; used by quacks; pretending to cure diseases; as, a quack medicine; a quack doctor.