The audience was captivated by the prancers with their high-stepping gait during the equestrian show.

prancers 是名词 prancer 的复数形式，由动词 prance（马匹昂首阔步地走）加后缀 -er 构成，指"昂首阔步行走的马匹"。prance 本身包含"昂首"和"跳跃"的动作意象，-er 后缀表示执行该动作的主体。