Noah Webster's Dictionary 1. (v. i.) To make a low repeated cry or sound, like the characteristic note of pigeons or doves. 2. (v. i.) To show affection; to act in a loving way. See under Bill.

Multi-Version Concordance Coo (1 Occurrence) Isaiah 59:11 We make a noise as bears -- all of us, And as doves we coo sorely; We wait for judgment, and there is none, For salvation -- it hath been far from us. (YLT)