[kwak], (Noun)

Definitions:
- the characteristic harsh sound made by a duck
(e.g: I heard a quack and saw some ducks huddled together)


Phrases:

Origin:
mid 16th century (as a verb): imitative

[kwak], (Verb)

Definitions:
- (of a duck) make a quack
(e.g: ducks quacked from the lake)


Phrases:

Origin:

[kwak], (Noun)

Definitions:
- a person who dishonestly claims to have special knowledge and skill in some field, typically medicine
(e.g: a quack doctor)


Phrases:

Origin:
mid 17th century: abbreviation of earlier quacksalver, from Dutch, probably from obsolete quacken ‘prattle’ + salf, zalf (see salve)