Definition of quack:

part of speech: verb

To cry like a duck.

part of speech: verb

To act or practise as a quack.

part of speech: adjective

Falsely pretending to cure diseases; pert. to or tainted with quackery.

part of speech: noun

The cry of a duck.

part of speech: noun

An ignorant pretender to medicine; a boastful pretender to skill or knowledge not possessed; an empiric.

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The act of making good any loss, damage, or injury; the restoration of something lost or taken away; amends; reparation. ...