To utter the murmuring sound of a dove or pigeon or a sound resembling it.
To talk fondly or amorously in murmurs: The visitors cooed over the newborn baby.
To express or utter with soft murmuring sounds.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.