1. the harsh sound made by a duck
2. a person who dishonestly claims to have medical knowledge or skills
Usage: derogatory

1. to make the harsh sound of a duck

1. relating to or characteristic of a medical charlatan
Usage: derogatory

Examples

• The duck let out a loud quack as it swam across the pond.
• We could hear the ducks quacking in the distance.
• The patient was treated by a quack who had no real medical training.
• She refused to see the quack doctor her neighbor recommended.
• The quack remedies sold online often do more harm than good.
• Don’t trust those quack treatments advertised on social media.
• The mallards began to quack excitedly when they saw the bread.