An example of to wail is to play an amazing piano solo in a jazz performance.
An example of a wail is a cry by a very upset baby.
The wind wailed through the trees.
The wail of a siren.
A wail of misery went up when new parking restrictions were announced.
The wind wailing in the trees.
To wail someone's death.
The wind wailed and the rain streamed down.
To wail one's death.
An example of to wail is to sob loudly at a funeral.