quack1Pronunciation: /kwak/Translate quack | into French | into German | into Italian | into Spanish Definition of quack noun the characteristic harsh sound made by a duck: I heard a quack and saw some ducks huddled together verb [no object] (of a duck) make a quack: ducks quacked from the lake informal (of a person) talk loudly and foolishly: he was still quacking about vinyl’s alleged superiority to CDsOrigin: mid 16th century (as a verb): imitativequack in other Oxford dictionaries Definition of quack in the US English dictionary
