nag

A horse, especially.

An old or worn-out horse.

A racehorse.

A small saddle horse or pony.

To annoy by constant scolding, complaining, or urging.

To torment persistently, as with anxiety or pain.

To scold, complain, or find fault constantly.

To be a constant source of anxiety or annoyance.

One who nags.

A nick; a notch.