[f. prec.] The sound uttered by doves and pigeons; a sound resembling this.
1729. Savage, Wanderer, i. (R.). Soft coos of distant doves.
1852. D. M. Moir, Poems, Bloom and Blight, v. The cushat’s coo of love.
1876. Smiles, Sc. Natur., vi. (ed. 4), 101. The wood-pigeon had uttered his last coo.
b. reduplicated.
1883. Pall Mall G., 3 Sept., 2/1. The perpetual, never-ceasing song of the wind … and the coo-coo of the wood-pigeon.
