GNU Collaborative International Dictionary of English

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1.       
   Coo (?), v. i. [imp. & p. p. Cooed (?); p. pr. & vb. n. Cooing.]
   1. To make a low repeated cry or sound, like the characteristic note of pigeons or doves.
   
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   The stockdove only through the forest cooes,
   
   Mournfully hoarse. Thomson.
   
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   2. To show affection; to act in a loving way. See under Bill, v. i. “Billing or cooing.”  Byron.
   
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