Definitions

1. noun

a person who pretends to be a doctor, especially one who sells fake medicines.

“The TV show poked fun at a quack who was selling useless medical remedies.”

2. verb

to make the sound of a duck.

“The children were quacking loudly in the backyard.”

3. verb

to speak or write nonsense, especially in a boastful or pretentious way.

“The politician’s speech was widely criticized for quacking about his non-existent achievements.”

4. verb

to sell or offer something of little value at a high price.

“The used car salesman was accused of quacking people out of their hard-earned money.”

5. interjection

an exclamation expressing excitement or surprise.

“Quack! I just won the lottery!”