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Definition of quack verb from the Oxford Advanced Learner's Dictionary

quack

verb
 
/kwæk/
 
/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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  1. when a duck quacks, it makes the noise that is typical of ducksTopics Birdsc1
    Oxford Collocations DictionaryQuack is used with these nouns as the subject:
    • duck
    See full entry
    Word Originverb mid 16th cent. (as a verb): imitative.
See quack in the Oxford Advanced American Dictionary

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