Nicker (verb)

1. To make a neighing sound, as a horse does.
2. To make a sound similar to a horse's neighing.

Origin:

It"s of uncertain origin, it"s first recorded in the 17th century.

Examples:

1. The horse nickered when it saw the apples in her hand.
2. The colt nickered softly as she approached the stall.
3. The horses nickered as they smelled the hay in the barn.
4. The stallion nickered and pawed the ground, ready to run.
5. The mare nickered as she was being groomed.