coo: Word of the day for February 2, 2018

coo , v :
(transitive, intransitive) To make a soft murmuring sound, as a pigeon. (intransitive) To speak in an admiring fashion, to be enthusiastic about.

Source http://handbookblogger.blogspot.com/2018/02/coo-word-of-day-for-february-2-2018.html