Simple past tense and past participle of quack.(verb)
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Use "quacked" in a sentence
"More than it's "quacked" up to be, duck meat is extremely versatile and can hold it's own when paired with a myriad of seasonings."
"The ducks circled around us, the ducks quacked around us, and the ducks factored us into the reflection of their tiny retinas but never considered us in any real way."
"“It quacked like a duck, … so I shot it” turned out to be a tad embarrassing last time, especially for Mr. Powell."