• • (RP) IPA: /kuː/
  • (GA) IPA: /ku/

coo (plural coos)

1. The murmuring#Adjective|murmuring sound#Noun|sound made by a dove or pigeon.
2. (by extension) An expression of pleasure made by a person.

• French: roucoulement
• German: Gurren, Girren
• Italian: cuccu
• Portuguese: arrulho
• Russian: воркова́ние
• Spanish: arrullo

coo (coos, present participle cooing; past and past participle cooed)

1. (ambitransitive) To make a soft murmuring#Adjective|murmuring sound#Noun|sound, as a pigeon.
   • 1810, Walter Scott, The Lady of the Lake; a Poem, Edinburgh: Printed [by James Ballantyne and Co.] for John Ballantyne and Co.; London: Longman, Hurst, Rees, and Orme, and William Miller, OCLC 6632529 ↗, canto III (The Gathering), stanza II, page 99 ↗:

     The black-bird and the speckled thrush / Good-morrow gave from brake and brush; / In answer cooed the cushat dove, / Her notes of peace, and rest, and love.

2. (intransitive) To speak in an admiring#Adjective|admiring fashion#Noun|fashion, to be enthusiastic about.

• French: roucouler
• German: gurren
• Italian: grugare, tubare, tortoreggiare
• Portuguese: arrulhar
• Russian: воркова́ть
• Spanish: arrullar

coo

1. (slang) Cool.

1. An expression of approval, fright#Noun|fright, surprise#Noun|surprise, etc. [from early 20th c.]
   • 1960, P[elham] G[renville] Wodehouse, chapter VII, in Jeeves in the Offing, London: Herbert Jenkins, OCLC 1227855 ↗:

     I stood outside the door for a space, letting "I dare not" wait upon "I would", as Jeeves tells me cats do in adages, then turned the handle softly, pushed – also softly – and, carrying on into the interior, found myself confronted by a girl in housemaid's costume who put a hand to her throat like somebody in a play and leaped several inches in the direction of the ceiling. "Coo!" she said, having returned to terra firma and taken aboard a spot of breath. "You gave me a start, sir!" […] "If you cast an eye on him, you will see that he's asleep now." "Coo! So he is."

coo (plural coos)

1. Initialism of chief operating officer
2. (international trade) Initialism of country of origin