Definition of “coo”
noun:
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The murmuring sound made by a dove or pigeon.
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verb:
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To make a soft murmuring sound, as a pigeon.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
To speak in an admiring fashion, to be enthusiastic about.
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adjective:
interjection:
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Expression of fright, surprise, approval, etc.
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