quack

noun

/kwæk/

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the sound that a duck makes
More Like This Animal sounds
Animal sounds
- baa
- caw
- coo
- meow
- moo
- neigh
- oink
- quack
- tu-whit, tu- whoo
- tweet
- woof
Topics Birdsc1
(informal, disapproving) a person who dishonestly claims to have medical knowledge or skills
- quack doctors
- I've got a check-up with the quack (= the doctor) next week.

Word Originnoun sense 1 mid 16th cent. (as a verb): imitative. noun sense 2 mid 17th cent.: abbreviation of earlier quacksalver, from Dutch, probably from obsolete quacken ‘prattle’ + salf, zalf (see salve).

quack

verb

/kwæk/

[intransitive]

Verb Forms

present simple I / you / we / they quack	/kwæk/ /kwæk/
he / she / it quacks	/kwæks/ /kwæks/
past simple quacked	/kwækt/ /kwækt/
past participle quacked	/kwækt/ /kwækt/
-ing form quacking	/ˈkwækɪŋ/ /ˈkwækɪŋ/

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when a duck quacks, it makes the noise that is typical of ducksTopics Birdsc1
Oxford Collocations Dictionary
Quack is used with these nouns as the subject:
duck
See full entry
Word Originverb mid 16th cent. (as a verb): imitative.