noun
the soft murmuring sound made by a dove or pigeon
verb
to make the soft murmuring sound of a dove or pigeon
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The dove let out a gentle coo as it perched on the tree branch.
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I heard the pigeon cooing outside my window this morning.
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The lovebirds were cooing to each other in the park.
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The singer's voice was so beautiful, it seemed to coo like a dove.