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 the Oxford Advanced Learner's Dictionary entry: quack

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