It was caused when a horse starting his first race tripped and went down.

I heard one of the Schoolmen calling me, then there was a shout as though his horse tripped.

It had been shaken out when the horse had tripped over that infernal pig.

The combined resistance from the two ropes threw the animal off balance, and the unfortunate horse tripped for a third time.

His horse tripped when we were crossing a stream and he fell.

The next horse was following too closely and tripped over the kicking legs of the first, dumping that rider, too.

Larry Jones, her trainer, commented that he believes the horse just tripped over her own feet.

More horses tripped on animals already down.

The jockey took a hard tumble after his horse tripped going around the curve.

I lost her again just before the mist started to clear, and then my horse practically tripped over you.