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Definition of quack verb from the Oxford Advanced American Dictionary

 

quack

 verb
verb
NAmE//kwæk//
 
[intransitive]Verb Forms present simple I / you / we / they quack
 
 he / she / it quacks
 
 past simple quacked
 
 -ing form quacking
 
 
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when a duck quacks, it makes the noise that is typical of ducks
See quack in the Oxford Advanced Learner's Dictionary
Check pronunciation: quack

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