quack

The characteristic sound uttered by a duck.

To utter the characteristic sound of a duck.

An untrained person who pretends to be a physician and dispenses medical advice and treatment.

A charlatan; a mountebank.

Relating to or characteristic of a quack.

To act as a medical quack or a charlatan.

To utter a harsh, flat, croaking sound or cry, as a goose or duck; croak; now, usually, to cry as a duck.

To make an outcry: said of persons.

A harsh, croaking sound.

The cry of a duck; a quacking.