verb
- past tense of quack; made the harsh cry of a duck
- past tense of quack; practiced medicine without proper qualifications
Usage: informal
Examples
- The duck quacked loudly at the pond.
- All the ducks quacked when we threw bread into the water.
- The mother duck quacked to call her ducklings.
- He quacked like a duck to make the children laugh.
- The old man quacked about miracle cures with no medical training.
- She accused him of having quacked his way through medical school.