vi. 咕咕地叫
vi.vt. 谈情话, 轻轻地说, 温柔可爱地说, 温柔爱恋地说

n. 鸽子的叫声, 鸽子叫似的轻声

Coo \Coo\, v. i. [imp. & p. p. {Cooed}; p. pr. & vb. n.
{Cooing}.]
1. To make a low repeated cry or sound, like the
characteristic note of pigeons or doves.

The stockdove only through the forest cooes,
Mournfully hoarse. --Thomson.

2. To show affection; to act in a loving way. See under
{Bill}, v. i. ``Billing or cooing.'' --Byron.