I. verb
COLLOCATIONS FROM OTHER ENTRIES
a duck quacks (= makes the sound ducks make )
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The ducks on the river started quacking.
EXAMPLES FROM CORPUS
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About a dozen mallard ducks were sleeping on the sand or quacking in a subdued manner under the dock.
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Clearly, enough investors think that Donald Duck will quack on into the twenty-second century!
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He gobbled, be quacked, grunted, swallowed syllables.
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One wing's shredded, one's flapping, it's quacking up a storm.
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She began a frantic quacking at the moment that Cyril got his two hands around her.
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The water is full of thrashing, quacking excitement.
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Young kids used to quack at us as we went past.
II. noun
EXAMPLES FROM OTHER ENTRIES
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Larry paid some quack over a thousand dollars to cure his insomnia.
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That quack doesn't know anything about treating heart disease.
EXAMPLES FROM CORPUS
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But when they open their mouths the same old hacking quacks come out, the same old self-serving screeds.
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If she mentioned paranoia, Buzz would insist that Elinor was the victim of a lot of quacks.
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There is always some magic remedy that will cure it, or some whizz-kid quack with a patent method.
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You may be considered an elitist or a quack .
III. adjective
EXAMPLES FROM OTHER ENTRIES
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a quack remedy for colds
EXAMPLES FROM CORPUS
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Many of those quack doctors were busy selling their own, often more dangerous diet cures.