📖 WordNook

quack

adjective
  1. medically unqualified
    “That quack doctor should be arrested.”
noun
  1. the harsh sound of a duck
    “The duck's quack is ruining my mood.”
  2. an untrained person who pretends to be a physician and who dispenses medical advice or a charlatan in general
    “I don't trust quacks; I ask to see credentials.”
verb
  1. to act as a medical quack or a charlatan
    “The imposter quacked all over town before they were caught.”
  2. to utter quacking noises
    “The ducks quacked all night long and I could not sleep.”