Etymology

coo

C3O1O1

Today it means: The murmuring sound made by a dove or pigeon. Full definition →

First used early 20th c.
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coo · noun, verb1

Onomatopoeic. Compare Dutch koeren.

coo · interjection2

Imitative.

coo · adjective3

Clipping of cool. Compare foo (“fool”).

First known use, by meaning

  • from early 20th c. An expression of approval, surprise, etc.

Etymology from Wiktionary, CC BY-SA 4.0.