Noun a sound made by a duck. Did you hear that duck make a quack? a fraudulent doctor of medicine, an impostor who claims to have qualifications to practice medicine. That doctor is nothing but a lousy quack! a charlatan. What a quack he is saying that's an organic Viagra™! (slang) a doctor. Translations Dutch: kwak (1), kwakzalver (2, 3) French: coin-coin (1) m; charlatan m (2, 3); toubib m (4) Indonesian: kwek-kwek (1), gadungan (2, 3) Interlingua: quac (1) Italian: qua qua (1) m; ciarlatano (2, 3); dottore (4) Spanish: cuac (1); curandero m (2) Adjective falsely presented as having medicinal powers. Don't get your hopes up; that's quack medicine! Verb to make a noise like a duck. The more breadcrumbs I threw on the ground, the more they quacked. Do you hear the ducks quack? Translations Dutch: kwaken French: faire coin-coin Interlingua: quaccar Italian: fare qua qua Spanish: decir cuac
