of a pigeon or a dove: to coo ...1922 rare
imitative of the bird's call
FIRST DOCUMENTED USE
1922 - see EXAMPLE below
"...Two carfuls of tourists passed slowly, their women sitting fore, gripping frankly the handrests. Pale faces. Men’s arms frankly round their stunted forms. They looked from Trinity to the blind columned porch of the bank of Ireland where pigeons roocoocooed..."
- James Augustine Aloysius Joyce