noun
the characteristic sound made by a cow or bull
verb
to make the characteristic sound of a cow or bull
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The cow let out a loud moo as the farmer approached with a bucket of feed.
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I love going to the farm and hearing the cows mooing in the fields.
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That cow's moo is so loud, it's like she's yelling for attention.
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The crowd at the concert let out a collective moo of excitement when the band took the stage.