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.
The stockdove only through the forest cooes,
Mournfully hoarse. --Thomson.
2. To show affection; to act in a loving way. See under Bill, v. i. “Billing or cooing.”
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cooing
adj : that is making a soft cry; "the cooing pigeons"