There are 3 definitions of coo in English:

coo1

Line breaks: coo
Pronunciation: /kuː
 
/

verb (coos, cooing, cooed)

[no object]
1(Of a pigeon or dove) make a soft murmuring sound: ringdoves cooed among the branches
More example sentences
  • It is peaceful - quiet now except for mourning doves cooing in a nearby mesquite.
  • A mourning dove cooed in the distance, accompanied by the never-ending drone of dragonflies and cicadas in the creek bed hidden behind the tall grass of the field.
  • The doves are cooing and wooing and calling for love.
1.1(Of a person) speak in a soft gentle voice: she cooed with delight as he unpacked the bags [with direct speech]: ‘I knew I could count on you,’ she cooed
More example sentences
  • ‘Ah, good,’ the man cooed softly, his voice lowering, becoming more reassuring.
  • The frail girl cooed in a soft voice that matched her fragile figure.
  • The rest of the girls grew into precious little flowers that danced across the room, parents cooed and clapped, and everyone forgot that Alicia, the seed, was curled up in the corner.

noun

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A soft murmuring sound made by a dove or pigeon: the coo of the dove
More example sentences
  • Deer run here, but nature was subdued - the soft coo of a pigeon, the tracks of a rabbit, the thinnest of the branches bent low and coated thick.
  • Wainwright isn't just a sweet songbird; she's the black dove with the weather-beaten coo and has the ability to howl like a seasoned blues singer.
  • In the eaves, doves' coos beat the intro over and over.

Origin

mid 17th century: imitative.

Definition of coo in:

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There are 3 definitions of coo in English:

coo2

Line breaks: coo
Pronunciation: /kuː
 
/

exclamation

British informal
Used to express surprise: ‘Coo, ain’t it high!’ Mary squeaked

Origin

early 20th century: imitative.

Definition of coo in:

There are 3 definitions of coo in English:

COO3

Line breaks: COO
Pronunciation: /siːəʊˈəʊ
 
/

noun

A chief operations (or operating) officer, a senior executive responsible for managing the day-to-day operations of a company or other institution.
More example sentences
  • I've been an administrative assistant for many Presidents, CFOs, and COOs.
  • All good CEOs and COOs excel at 10 core leadership competencies, but truly great executives outperform their peers in different ways.
  • He also spent almost a decade at Toys"R"Us Inc. as its COO.

Definition of coo in: