Coo (?), v. i. [imp. & p.p. Cooed (?); p.pr. & vb.n. Cooing.]
To make a low repeated cry or sound, like the characteristic note of pigeons or doves.
The stockdove only through the forest cooes,
To show affection; to act in a loving way. See under Bill, v. i.
"Billing or cooing
© Webster 1913.