Definition:

A horse that stops and refuses to move, or may rear, root to evade the bit, back up, or turn around and refuse to go forward is balking. Horses that have a habit of this are said to be balky.

Pronunciation:

b ä w k

b ä w k e

Examples:

We thought we had bought a quiet child's pony for our daughter, but it turned out to be quite balky.